Onew

{{Main|Shinee}}

Onew was discovered at the 2006 SM Academy Casting. He received great appreciation from Lee Soo-man, SM Entertainment's founder, at Girls' Generation's debut showcase. Lee Soo-man noticed him and wanted to hear him sing during a one-time on-the-spot audition. He signed a contract with the company the day after he auditioned.{{cite web|url=http://news.nate.com/view/20120927n05064?mid=e0103|script-title=ko:'라디오스타', 이모팬 대리만족 방송|trans-title='Radio Star', Aunt Fan surrogate broadcasting|access-date=September 26, 2012|language=ko|archive-date=February 7, 2021|archive-url=https://web.archive.org/web/20210207142021/https://news.nate.com/view/20120927n05064?mid=e0103|url-status=live}}{{cite web|url=http://news.nate.com/view/20120927n04003?mid=e0103|title=SHINee's Onew reveals how he was cast into SM Entertainment by Lee Soo Man|access-date=September 26, 2012|language=ko|archive-date=March 22, 2022|archive-url=https://web.archive.org/web/20220322185433/https://news.nate.com/view/20120927n04003?mid=e0103|url-status=live}} In 2008, he was chosen as the leader of the group Shinee, and the five-member boy group debuted on May 25, 2008, on SBS' Inkigayo.{{cite news|url=http://www.hankyung.com/news/app/newsview.php?aid=2008051955278&intype=1|archive-url=https://web.archive.org/web/20150704185121/http://www.hankyung.com/news/app/newsview.php?aid=2008051955278&intype=1|archive-date=July 4, 2015|title=SM, 10대 밴드 '샤이니' 공개|trans-title=SM to debut a new boy group|work=The Korea Economic Daily via Seoul Yonhap News|access-date=July 4, 2015|date=May 19, 2008}} Shortly after debut, Onew contributed to singles for Lee Hyun-ji in 2008, titled "Vanilla Love" and "Vanilla Love Part 2".{{cite news|url=http://www.newsen.com/news_view.php?uid=200810290945511002|script-title=ko:이현지 첫 미니앨범 샤이니 온유 피처링 지원사격|trans-title=Lee Hyun-ji first mini album features SHINee's Onew|work=Newsen|access-date=December 12, 2009|date=October 29, 2008|language=ko|archive-date=March 4, 2016|archive-url=https://web.archive.org/web/20160304213016/http://www.newsen.com/news_view.php?uid=200810290945511002|url-status=live}} In 2009, he recorded the song "One Year Later" with Girls' Generation member Jessica for the Genie EP.{{cite web|url=http://osen.mt.co.kr/article/G0906220044|script-title=ko:소녀시대, 새 앨범 25일 발매 '온유-제시카 듀엣곡 수록'|trans-title=SNSD's new album to be released, featuring Jessica's duet with new|work=Osen|access-date=July 20, 2009|date=June 22, 2009|language=ko|archive-date=July 11, 2015|archive-url=https://web.archive.org/web/20150711044802/http://osen.mt.co.kr/article/G0906220044|url-status=live}} The same year, he also sang a duet with Kim Yeon-woo, "The Name I Loved", for Shinee's third EP 2009, Year of Us.{{cite news|url=http://www.newsen.com/news_view.php?uid=200910111003081002|script-title=ko:샤이니 온유 데뷔 첫 솔로곡 공개..김연우 피처링 어떤 느낌?|trans-title=SHINee Onew released his first solo featuring Kim Yeon Woo|work=Newsen|access-date=October 20, 2009|date=October 11, 2009|language=ko|archive-date=May 13, 2011|archive-url=https://web.archive.org/web/20110513094721/http://www.newsen.com/news_view.php?uid=200910111003081002|url-status=live}}

In 2010, Onew tried his hand at songwriting and, together with his bandmate Minho, wrote the lyrics for the song "Your Name" from Shinee's second studio album Lucifer.{{cite news|last=Kim|first=Myeongsin|script-title=ko:샤이니, 정규 2집 '루시퍼' 컴백…온유-종현 작사곡 '유어네임'-'욕' 화제|trans-title=SHINee, second full album 'Lucifer' – Jonghyun, Onew, Minho involved in lyrics writing|url=http://www.hankyung.com/news/app/newsview.php?aid=2010071954337|access-date=May 27, 2013|newspaper=Korea Economy|date=July 19, 2010|archive-date=December 12, 2013|archive-url=https://web.archive.org/web/20131212150631/http://www.hankyung.com/news/app/newsview.php?aid=2010071954337|url-status=live}} In addition to music, Onew became an MC of two programs—KBS2's Night Star, which he co-hosted alongside Shin Dong-yup, Yoon Jong-shin, movie director Jang Hang Joon, and Leessang's Gil,{{cite news|url=http://www.newsen.com/news_view.php?uid=201005050859321001|title=샤이니 온유 MC데뷔 '야행성' 밤샘 버라이어티 뭘까?|newspaper=샤이니 온유 Mc데뷔 '야행성' 밤샘 버라이어티 뭘까? - 손에 잡히는 뉴스 눈에 보이는 뉴스 - 뉴스엔 |date=May 5, 2010 |trans-title=SHINee's Onew makes his debut as MC on new variety show|publisher=Newsen|access-date=May 5, 2010|language=ko|archive-date=May 10, 2010|archive-url=https://web.archive.org/web/20100510153147/http://newsen.com/news_view.php?uid=201005050859321001|url-status=live}} and MBC's Show! Music Core.{{in lang|ko}} [http://www.asiae.co.kr/news/view.htm?sec=ent99&idxno=2010102914252303878 온유·민호·수지·지연, '음악중심' 새 MC 발탁 '기대만발' (Onew, Minho, Suzy, Jiyeon as New Music Core MCs, "High Expectations")] {{Webarchive|url=https://web.archive.org/web/20120305075051/http://www.asiae.co.kr/news/view.htm?sec=ent99&idxno=2010102914252303878 |date=March 5, 2012 }}. Asia Economy. October 29, 2010. Retrieved November 11, 2010. Since his first job as an MC, Onew has hosted various events, such as Dream Concert, Incheon K-Pop Concert and Mnet's special event in Taiwan called Nihao Taiwan.{{cite news|url=http://www.newsen.com/news_view.php?uid=201209092050182910|title=온유-민효린-키 '인천 K-POP 콘서트 MC'|newspaper=[포토엔]온유-민효린-키 '인천 K-Pop 콘서트 Mc' - 손에 잡히는 뉴스 눈에 보이는 뉴스 - 뉴스엔 |date=September 9, 2012 |publisher=Newsen|access-date=September 9, 2012|language=ko|archive-date=August 12, 2016|archive-url=https://web.archive.org/web/20160812010537/http://www.newsen.com/news_view.php?uid=201209092050182910|url-status=live}}{{cite web|url=http://entertain.naver.com/read?oid=311&aid=0000218053|script-title=ko:온유-구하라-윤두준 '드림콘서트 진행 맡았어요'[포토]|publisher=Naver|access-date=May 11, 2013|language=ko|archive-date=November 29, 2018|archive-url=https://web.archive.org/web/20181129142115/https://entertain.naver.com/read?oid=311&aid=0000218053|url-status=live}}{{Cite news|title=온유-토니안, '엠카운트다운 타이완' 2MC!|url=http://view.asiae.co.kr/news/view.htm?idxno=2013042512242842329&nvr=Y|date=April 25, 2013|access-date=May 12, 2013|language=ko|archive-date=August 12, 2016|archive-url=https://web.archive.org/web/20160812235504/http://view.asiae.co.kr/news/view.htm?idxno=2013042512242842329&nvr=Y|url-status=live}}

File:100916 Rock of Ages 온드류! 02.jpg

Onew starred in various musicals starting from 2010, debuting in the musical Brothers Were Brave alongside singer Lee Ji-hoon.{{in lang|ko}} [http://www.newsen.com/news_view.php?uid=201002221113381001 샤이니 온유 '형제는 용감했다' 뮤지컬 데뷔! 홍록기-이지훈과 호흡 (SHINee's Onew Debuts in Musical "Brave Brothers" with Hong Rokki and Lee Ji-Hoon)] {{Webarchive|url=https://web.archive.org/web/20120527144735/http://www.newsen.com/news_view.php?uid=201002221113381001 |date=May 27, 2012 }}. Newsen. February 22, 2010. Retrieved November 11, 2010. He then starred in the Korean production of Rock of Ages playing the lead role, Drew.{{in lang|ko}} [http://www.newsen.com/news_view.php?uid=201009161628511001 온유 "뮤지컬, 재밌어..샤이니 멤버도 격려해줘" (Onew: "Musicals are Fun...Please Also Encourage Shinee Members")] {{Webarchive|url=https://web.archive.org/web/20120527144758/http://www.newsen.com/news_view.php?uid=201009161628511001 |date=May 27, 2012 }}. Newsen. September 16, 2010. Retrieved November 11, 2010. Onew has also showcased his acting skills via television like having a cameo role as a clumsy doctor in the drama Dr. Champ. He appeared in the drama's final episode.{{in lang|ko}} [http://news.nate.com/view/20101116n26828 '닥터챔프' 마지막회, 온유-민효린 깜짝 출연 '눈길' (Shinee's Onewand Min Hyo Rin appeared in SBS's 'Doctor Champ' finale)] {{Webarchive|url=https://web.archive.org/web/20190831182411/https://news.nate.com/view/20101116n26828 |date=August 31, 2019 }} Nate. November 16, 2010. November 28, 2010. He also had cameo roles in the dramas Athena: Goddess of War, Oh My God x2,{{cite news|last=Ho|first=Stewart|title=SHINee's Onew Couples Up with CSJH's Sunday|url=http://mwave.interest.me/enewsworld/en/article/5579/shinees-onew-to-appear-on-sbs-sitcom-with-csjhs-sunday|access-date=June 26, 2015|date=April 17, 2012|archive-url=https://web.archive.org/web/20160304050749/http://mwave.interest.me/enewsworld/en/article/5579/shinees-onew-to-appear-on-sbs-sitcom-with-csjhs-sunday|archive-date=March 4, 2016|url-status=dead}} Pure Love and sitcom Royal Villa.{{cite news|title=Onew's interview for jTBC's "Sitcom Royal Villa"|url=http://isplus.live.joins.com/news/article/article.asp?total_id=12005382&cloc=|access-date=June 26, 2015|date=July 8, 2013|newspaper=Ilgan Sports|archive-date=March 4, 2016|archive-url=https://web.archive.org/web/20160304053843/http://isplus.live.joins.com/news/article/article.asp?total_id=12005382&cloc=|url-status=live}} In August 2012, Onew recorded a song titled "In Your Eyes" for the drama series To the Beautiful You.{{cite web|url=http://music.naver.com/artist/home.nhn?artistId=39710|script-title=ko:박근철|publisher=Naver|access-date=July 18, 2013|language=ko|archive-date=March 22, 2022|archive-url=https://web.archive.org/web/20220322185450/https://vibe.naver.com/artist/39710|url-status=live}} Onew also sang the soundtrack "Moonlight" for the drama Miss Korea. The song was released on January 3, 2014.{{cite news|title=Moonlight iTunes page|url=http://osen.mt.co.kr/article/G1109755292|publisher=Osen|access-date=January 15, 2014|date=January 3, 2014|archive-date=August 14, 2016|archive-url=https://web.archive.org/web/20160814043513/http://osen.mt.co.kr/article/G1109755292|url-status=live}}

File:Onew at Dream Concert 2015.jpg in May 2015]]

On January 14, 2014, his participation in the Borneo edition of the reality show Law of the Jungle was confirmed.{{Cite news|url=http://osen.mt.co.kr/article/G1109761402|script-title=ko:봉태규·온유·이영아·동준..'정글' 7人 라인업 완성|date=January 13, 2014|publisher=OSEN|access-date=January 13, 2014|language=ko|archive-date=January 16, 2014|archive-url=https://web.archive.org/web/20140116070631/http://osen.mt.co.kr/article/G1109761402|url-status=live}} He was also originally cast for the Brazil edition, but had to be replaced because of schedule conflicts.{{cite web|title=Kangin and Hyuk to Replace Lee Min Woo and Onew on 'Laws of the Jungle Brazil'|url=http://mwave.interest.me/enewsworld/en/article/61077/kangin-and-hyuk-head-for-the-jungle|access-date=March 16, 2014|archive-url=https://web.archive.org/web/20140316103557/http://mwave.interest.me/enewsworld/en/article/61077/kangin-and-hyuk-head-for-the-jungle|archive-date=March 16, 2014|url-status=dead}} In addition to his group activities and his job as a MC, Onew gained experience in radio hosting and took over shows like Kiss the Radio, a popular radio program aired on KBS Cool FM which is hosted by his labelmates Super Junior.{{cite web|title=온유, '음주' 강인 대신해 '슈키라' 일일 DJ[공식]|trans-title=Onew, 'Drinking' Kangin's replacement 'Shukira' as daily DJ [Official]|url=http://isplus.live.joins.com/news/article/article.asp?total_id=20074481&cloc=|archive-url=https://web.archive.org/web/20200811133633/http://isplus.live.joins.com/news/article/article.asp?total_id=20074481&cloc=|date=May 25, 2015|archive-date=August 11, 2020|url-status=dead}}{{Cite web |url=http://news.mk.co.kr/newsRead.php?year=2016&no=374130 |title=강인 음주운전, 제작진에 동료 스타들까지…줄줄이 '민폐'. MK News. May 25, 2016. Retrieved June 26, 2015. |access-date=June 18, 2016 |archive-date=March 22, 2022 |archive-url=https://web.archive.org/web/20220322185451/https://www.mk.co.kr/news/entertain/view/2016/05/374130/ |url-status=live }} In June 2014, he was originally planning to appear in the musical Singin' in the Rain but was unable to join as he underwent vocal cord surgery.

In 2016, Onew was cast in the drama Descendants of the Sun, which starred Song Hye-kyo and Song Joong-ki. He portrayed first-year resident Dr. Lee Chi-hoon, a junior of Song Hye-kyo's character.{{Cite web |url=http://star.mt.co.kr/view/stview.php?no=2015052609530045533&type=1&outlink=1 |title=강신일, '태양의 후예' 출연..송중기와 부자 호흡. Starnews. May 26, 2015. Retrieved June 26, 2015. |date=May 26, 2015 |access-date=June 25, 2015 |archive-date=June 26, 2015 |archive-url=https://web.archive.org/web/20150626123626/http://star.mt.co.kr/view/stview.php?no=2015052609530045533&type=1&outlink=1 |url-status=live }}{{cite web|url=http://www.tvreport.co.kr/?c=news&m=newsview&idx=721898|title=First script read for blockbuster melodrama Descendants of the Sun|publisher=TV Report|access-date=June 3, 2015|language=ko|archive-date=November 28, 2018|archive-url=https://web.archive.org/web/20181128164524/https://www.tvreport.co.kr/?c=news&m=newsview&idx=721898|url-status=live}}{{cite web|url=http://sports.donga.com/3/all/20160414/77587469/2|script-title=ko:'태후' 온유, 종영소감 "선배들, 감독님 덕분에 무사히 마무리"|work=Donga News|date=April 14, 2016 |access-date=June 10, 2016|language=ko|archive-date=August 22, 2016|archive-url=https://web.archive.org/web/20160822061258/http://sports.donga.com/3/all/20160414/77587469/2|url-status=live}} The drama became a huge success, especially in China, where the series reached more than 2 billion views on the Chinese streaming site iQiyi. In Korea, the drama became a massive hit as well, surpassing more than 30 percent viewership ratings nationwide.{{Cite web |url=http://kpopherald.koreaherald.com/view.php?ud=201604061316599349001_2 |title='Descendants of the Sun' reaches 2 billion views in China. Kpop Herald. April 6, 2016. Retrieved June 19, 2016. |access-date=June 18, 2016 |archive-date=April 24, 2016 |archive-url=https://web.archive.org/web/20160424145658/http://kpopherald.koreaherald.com/view.php?ud=201604061316599349001_2 |url-status=live }} Onew was awarded the Newcomer Scene Stealer Award at the 2016 Scene Stealer Festival for his role in Descendants of the Sun.{{Cite web |url=http://news.chosun.com/site/data/html_dir/2016/07/07/2016070700789.html |title=온유-신혜선, 신스틸러페스티벌 신인상 수상 확정 Chosun. July 7, 2016. Retrieved July 18, 2016. |access-date=July 18, 2016 |archive-date=July 8, 2016 |archive-url=https://web.archive.org/web/20160708134729/http://news.chosun.com/site/data/html_dir/2016/07/07/2016070700789.html |url-status=live }} Onew was also confirmed for a new tvN program Eat, Sleep, Eat which serves local recipes through Southeast Asia.{{Cite web |url=http://entertain.naver.com/read?oid=213&aid=0000889041&lfrom=twitter |title=백종원XtvN 新 예능 론칭…온유·정채연과 '먹고 자고 먹고' TV Report via Naver. July 8, 2016. Retrieved July 10, 2016. |access-date=July 9, 2016 |archive-date=May 9, 2018 |archive-url=https://web.archive.org/web/20180509075529/http://entertain.naver.com/read?oid=213&aid=0000889041&lfrom=twitter |url-status=live }} On August 12, Onew and Lee Jin-ah released a duet, "Starry Night", as part of SM Station, a digital music project by SM Entertainment. It is a pop jazz song which is the work of numerous artists, including Andreas Oberg, a Swedish guitarist and songwriter, and singer-composer Yoo Hee-yeol.{{Cite news|title=Onew, Lee Ji-na announce duet|url=http://koreajoongangdaily.joins.com/news/article/article.aspx?aid=3022394|author=Jin Min-ji|date=August 10, 2016|access-date=September 2, 2016|archive-date=August 18, 2016|archive-url=https://web.archive.org/web/20160818054838/http://koreajoongangdaily.joins.com/news/article/Article.aspx?aid=3022394|url-status=live}}

In October 2016, Onew wrote the song "So Amazing" for Shinee's fifth Korean studio album 1 of 1,{{cite web|title =SHINee returns with '90s new jack swings |author=Kim Jae-heun|url = https://m.koreatimes.co.kr/pad/news/view.jsp?req_newsidx=215338|website=The Korea Times|access-date =October 4, 2016|date=October 4, 2016|url-status =live |archive-url=https://web.archive.org/web/20161004152856/http://m.koreatimes.co.kr/pad/news/view.jsp?req_newsidx=215338|archive-date=October 4, 2016}} and another song, "Beautiful Life", for its repackaged album, 1 and 1.{{cite web|script-title=ko:"샤이니표 발라드"..5집 리패키지 오늘(14일)밤 공개|trans-title=Shinee return with a ballad.. 5th album repackage to be released today at night |author=Park Hyun-min|url = http://entertain.naver.com/read?oid=109&aid=0003431928&spi_ref=m_search_twitter|website=Naver|access-date =November 14, 2016|date=November 14, 2016|archive-url=https://web.archive.org/web/20171004085820/http://entertain.naver.com/read?oid=109&aid=0003431928&spi_ref=m_search_twitter|archive-date=October 4, 2017|language=ko}}

In May 2017, Onew and indie duo Rocoberry released the song "Lullaby" as part of SM Station.{{Cite news|url=http://kpopherald.koreaherald.com/view.php?ud=201705021722383238589_2&ACE_SEARCH=1|title=Onew, Roco release teaser clip for new song|last=Lee|first=Joel|date=May 2, 2017|work=Kpop Herald|access-date=June 8, 2017|archive-date=May 28, 2018|archive-url=https://web.archive.org/web/20180528215818/http://kpopherald.koreaherald.com/view.php?ud=201705021722383238589_2&ACE_SEARCH=1|url-status=live}} In June 2017, Onew was featured in Heize's music video for the song "I Don't Know You".{{Cite news|url=http://m.entertain.naver.com/read?oid=109&aid=0003562152|title=샤이니 온유, 헤이즈 신곡 '널 너무 모르고' MV 출연…커플연기 호흡|access-date=June 22, 2017|language=ko|archive-date=August 16, 2017|archive-url=https://web.archive.org/web/20170816110910/http://m.entertain.naver.com/read?oid=109&aid=0003562152|url-status=live}} In August 2017, shortly before the release of Age of Youth 2, Onew was accused of sexual harassment and decided to leave the project after discussions with the production staff of the show.{{Cite news|url=http://entertain.naver.com/now/read?oid=311&aid=0000764657|title=SM 측 "온유, 제작진과 상의해 '청춘시대2' 하차 결정" (공식)|trans-title=SM Entertainment "Onew, talk to the production team" decision to get off age of youth 2 "|date=August 16, 2017|work=Naver|access-date=August 16, 2017|language=ko|archive-date=July 14, 2018|archive-url=https://web.archive.org/web/20180714051020/http://entertain.naver.com/now/read?oid=311&aid=0000764657|url-status=live}}{{Cite news|url=http://sports.chosun.com/news/news.htm?id=201708170100145370010556&ServiceDate=20170816|title=[공식]온유·JTBC 양측 "'청춘시대2' 하차 확정..후임 물색중"|trans-title=[Official] Both sides of Onew, JTBC decided to take him off out 'Age of Youth 2' .. In search of successor "|last=Lee|first=Seung-mi |date=August 16, 2017|work=Naver|access-date=August 16, 2017|language=ko|archive-date=August 16, 2017|archive-url=https://web.archive.org/web/20170816105221/http://sports.chosun.com/news/news.htm?id=201708170100145370010556&ServiceDate=20170816|url-status=live}} Onew went into hiatus and did not participate in the remaining shows of Shinee's 2017 concert tour in Japan.{{cite news|last1=Kwon|first1=Soo-bin|title=SM 측 "온유, 반성의 시간 선택...샤이니 日 공연 불참"(공식)|url=http://star.hankookilbo.com/News/Read/0077bc07948ecf6e0077bc07948ecf6e|access-date=April 6, 2018|work=Star Hankook|date=August 28, 2016|language=ko|archive-date=April 6, 2018|archive-url=https://web.archive.org/web/20180406230002/http://star.hankookilbo.com/News/Read/0077bc07948ecf6e0077bc07948ecf6e|url-status=dead}} On April 6, 2018, after eight months of investigation, the prosecution dropped all charges against him.{{cite news|url=http://metro.co.uk/2018/04/06/sexual-harassment-case-against-shinees-onew-dismissed-7445418/|title=Sexual harassment case against SHINee's Onew dismissed|author=Jonah Hicap|access-date=February 6, 2018|archive-date=April 6, 2018|archive-url=https://web.archive.org/web/20180406163720/http://metro.co.uk/2018/04/06/sexual-harassment-case-against-shinees-onew-dismissed-7445418/|url-status=live}}

File:180629 SHINee 스타필드 고양 팬싸인회 2 (cropped).jpg

In May 2018, Onew was featured in Kim Yeon-woo's fifth studio album in the song "Play the Field", which he helped write.{{cite web|url=https://www.newsen.com/news_view.php?uid=201805100843120710|script-title=ko:하림·온유 지원사격" 김연우, 오늘(10일) 7년만 정규앨범 발매|trans-title="Harim and Onew support shooting" Kim Yeon-woo, today (10th) release a full-length album for the first time in 7 years|work=Newsen|access-date=June 12, 2022|date=May 10, 2018|language=ko|archive-date=June 12, 2022|archive-url=https://web.archive.org/web/20220612003752/https://www.newsen.com/news_view.php?uid=201805100843120710|url-status=live}} Onew's debut EP, Voice, was released on December 5, 2018, with the lead single "Blue". It included two songs co-written by Onew, "Shine On You" and "Illusion".{{cite news|url=https://www.billboard.com/articles/columns/k-town/8488869/onew-shinee-voice-album-blue-song|title=Onew of SHINee Releases 'Voice' Debut Album|author=Tamar Herman|access-date=December 12, 2018|archive-date=December 13, 2018|archive-url=https://web.archive.org/web/20181213154220/https://www.billboard.com/articles/columns/k-town/8488869/onew-shinee-voice-album-blue-song|url-status=live}} Onew was unable to promote the EP as he enlisted for his mandatory military service as an active duty soldier on December 10, 2018, just five days after its release.{{cite news|url=https://entertain.naver.com/now/read?oid=609&aid=0000014046|title=SM 측 "샤이니 온유 12월 10일 현역 입대, 비공개로 조용히"(공식입장)|trans-title=SM confirm Onew's enlistment in active duty|work=Newsen|first=Hye-jin|last=Hwang|access-date=November 10, 2018|archive-date=January 31, 2021|archive-url=https://web.archive.org/web/20210131082620/https://entertain.naver.com/now/read?oid=609&aid=0000014046|url-status=live}}

In January 2019, Onew joined the military musical Shinheung Military Academy, which tells the story of patriotic youths who fought to gain independence from Japan.{{Cite web|author=Park Jin-young|date=January 25, 2019|title=신흥무관학교' 지창욱·강하늘·김성규·조권·온유 캐스팅..2월 앵콜 공연 [공식입장]|trans-title=Shin Heung Institut 'Ji Chang-wook, Kang Han-il, Kim Seong-gyu, Jo Kwon, and On You Cast. February Encore Performance [Official Admission]|url=https://entertain.naver.com/read?oid=109&aid=0003942205|access-date=September 24, 2019|website=Naver|archive-date=January 27, 2019|archive-url=https://web.archive.org/web/20190127205718/https://entertain.naver.com/read?oid=109&aid=0003942205|url-status=live}} On April 11, 2019, he performed part of the musical at the 100th anniversary of the establishment of South Korea's provisional government.{{Cite web|author=Park Seong-jun|date=April 15, 2019|title=온유·강하늘 임시정부수립 100주년 기념식 뮤지컬 시연|trans-title=Onew and Kang Ha-neul Musical demonstration at the 100th anniversary of the establishment of the Provisional Government|url=https://www.ajunews.com/view/20190411205714020|access-date=June 15, 2022|website=AJU News|archive-date=June 14, 2022|archive-url=https://web.archive.org/web/20220614231016/https://www.ajunews.com/view/20190411205714020|url-status=live}} In August 2019, Onew joined another military musical titled Return: The Promise of That Day together with Exo member Xiumin taking the role of the young Seung-ho. The original army musical deals with the topic of excavating the remains of the heroic soldiers who sacrificed themselves to protect their country during the Korean War.{{Cite web|author=Jang Jin-ri|date=August 26, 2019|title=[단독]샤이니 온유-엑소 시우민, 육군 뮤지컬 '귀환: 그날의 약속' 출연|trans-title=[Exclusive] SHINee Onew-EXO Xiumin Appears in Army Musical 'Return: Promise of the Day'|url=https://entertain.naver.com/read?oid=477&aid=0000203822|access-date=September 24, 2019|website=SPOTV News via Naver|archive-date=September 24, 2019|archive-url=https://web.archive.org/web/20190924121511/https://entertain.naver.com/read?oid=477&aid=0000203822|url-status=live}} Onew was officially discharged from the military on July 8, 2020, 12 days earlier than his expected date of discharge in light of South Korea's efforts to combat COVID-19.{{Cite web |url=https://n.news.naver.com/entertain/now/article/018/0004683828 |title=[단독] 샤이니 온유, 오늘(8일) 말년휴가…미복귀 제대 |language=ko |trans-title=SHINee Onew takes last military vacation today (July 8th), will not return |last=Kim |first=Gayoung |date=July 8, 2020 |website=EDaily |publisher=Naver |access-date=November 15, 2020 |archive-date=November 16, 2020 |archive-url=https://web.archive.org/web/20201116040924/https://n.news.naver.com/entertain/now/article/018/0004683828 |url-status=live }}

In January 2021, Onew resumed activities as part of Shinee.{{cite web |last1=Park |first1=Han-sol |title=K-pop groups prepare for returns after members finish mandatory military service |date=January 27, 2021 |url=https://www.koreatimes.co.kr/www/nation/2021/01/732_303176.html |publisher=The Korea Times |access-date=July 23, 2021 |archive-date=July 23, 2021 |archive-url=https://web.archive.org/web/20210723132816/https://www.koreatimes.co.kr/www/nation/2021/01/732_303176.html |url-status=live }} On February 4, 2021, Onew released a song titled "Shadow" as a soundtrack for the drama series Breakup Probation: One Week.{{cite web |last1=Choi |first1=Ji-eun |title=샤이니 온유, 이별유예, 일주일 OST '그림자' 오늘(4일) 발매 |trans-title=SHINee Onew, Farewell Grace, One Week OST 'Shadow' Released Today (4th) |url=https://www.topdaily.kr/articles/54936 |publisher=Top Daily |access-date=June 8, 2022 |language=ko |url-status=live |archive-date=June 8, 2022 |archive-url=https://web.archive.org/web/20220608002704/https://www.topdaily.kr/articles/54936 }} In May 2021, Onew was cast in the musical Midnight Sun as the male lead Ha-ram.{{Cite news|last=Kang|first=Ae-ran|date=March 9, 2021|title=뮤지컬 '태양의노래' 5월개막…샤이니 온유·러블리즈 케이 출연|trans-title=The musical 'Song of the Sun' opens in May... SHINee Onew, Lovelyz Kei appearance|url=https://www.yna.co.kr/view/AKR20210309073200005?input=1195m|access-date=March 11, 2021|website=Yonhap News Agency|archive-date=August 11, 2021|archive-url=https://web.archive.org/web/20210811004645/https://www.yna.co.kr/view/AKR20210309073200005?input=1195m|url-status=live}}{{cite web |last1=Frater |first1=Patrick |title='Midnight Sun' Shines Again as K-Pop Stage Musical Aimed at Cinemas |url=https://variety.com/2021/theater/asia/midnight-sun-korea-stage-musical-k-pop-cinema-1234958543/ |website=Variety |date=April 23, 2021 |publisher=Variety Media LLC |access-date=July 23, 2021 |archive-date=July 23, 2021 |archive-url=https://web.archive.org/web/20210723132816/https://variety.com/2021/theater/asia/midnight-sun-korea-stage-musical-k-pop-cinema-1234958543/ |url-status=live }} For the musical soundtrack, Onew released two songs, "Meet Me When the Sun Goes Down" and "Good-bye Days" which is a duet with Kei.{{cite web |title=태양의 노래' 온유·케이 하모니 담은 글로벌 음원 Part.4 공개| date=May 24, 2021 | trans-title='Song of the Sun' global sound source Part.4 featuring Onew and K harmony released |url=https://www.xportsnews.com/?ac=article_view&entry_id=1427562 |publisher=Xports News |access-date=June 10, 2022 |archive-date=June 10, 2022 |archive-url=https://web.archive.org/web/20220610033905/https://www.xportsnews.com/?ac=article_view&entry_id=1427562 |language=ko |url-status=live }} In July 2021, Onew appeared as a regular cast member on Sea of Hope, a variety show where celebrities cook and sing for guests.{{Cite web|url=https://entertain.naver.com/now/read?oid=076&aid=0003733761|title=[공식]新예능 '바라던 바다' 윤종신·이동욱·이지아·김고은·온유·이수현 출연 확정|trans-title=[Official] New entertainment 'The Desired Sea' Yoon Jong-shin, Lee Dong-wook, Lee Ji-ah, Kim Go-eun, Onew, Lee Soo-hyun confirmed to appear|last=Lee|first=Seung-mi|date=May 25, 2021|website=Naver via Sports Chosun|publisher=Sports Chosun|access-date=June 12, 2021|archive-date=May 30, 2021|archive-url=https://web.archive.org/web/20210530232757/https://entertain.naver.com/now/read?oid=076&aid=0003733761|url-status=live}}{{Cite news|author=Kang Hyo-jin|title=이지아·이동욱·윤종신·김고은…JTBC 새 예능 '바라던 바다' 출연[공식]|url=https://entertain.naver.com/now/read?oid=477&aid=0000301249|website=Sport TV News|date=May 25, 2021|access-date=May 25, 2021|language=ko|archive-date=May 25, 2021|archive-url=https://web.archive.org/web/20210525065950/https://entertain.naver.com/now/read?oid=477&aid=0000301249|url-status=live}} On August 3, 2021, Onew released a song titled "Dear My Spring" as a soundtrack for the drama series You Are My Spring.{{Cite news |url=https://star.mt.co.kr/stview.php?no=2021080309232810007 |title=샤이니 온유, '너는 나의 봄' OST 가창 [공식] |newspaper=스타뉴스 |date=August 3, 2021 |trans-title=SHINee Onew, 'You Are My Spring' OST Sing [Official]|access-date=June 8, 2022 |archive-date=August 6, 2021 |archive-url=https://web.archive.org/web/20210806060936/https://star.mt.co.kr/stview.php?no=2021080309232810007 |language=ko |url-status=live }} In September 2021, Onew joined the cast of March of the Ants Chapter 5, a reality show about investing in the stock market.{{Cite news|last=Moon|first=Jiyeon|date=September 8, 2021|title=[공식] '개미는 뚠뚠 챕터5' 샤이니 온유 뉴 개미 합류..14일 공개|language=ko|trans-title='March of the Ants Chapter 5' SHINee Onew joins as new ant… release on 14 September|work=Sports Chosun|url=https://sports.chosun.com/news/ntype.htm?id=202109080100060240003675&servicedate=20210908|access-date=September 8, 2021|archive-date=September 8, 2021|archive-url=https://web.archive.org/web/20210908035914/https://sports.chosun.com/news/ntype.htm?id=202109080100060240003675&servicedate=20210908|url-status=live}} On October 5, 2021, Onew and Elaine released a duet, "Blue", as part of the soundtrack for the drama series High Class.{{Cite web |url=http://www.mydaily.co.kr/new_yk/html/read.php?newsid=202110050926449269 |title=샤이니 온유X일레인, '하이클래스' OST로 뭉쳤다 |date=October 5, 2021 |trans-title=SHINee's Onew X Elaine united for 'High Class' OST |access-date=June 8, 2022 |language=ko |url-status=live |archive-date=June 8, 2022 |archive-url=https://web.archive.org/web/20220608004358/http://www.mydaily.co.kr/new_yk/html/read.php?newsid=202110050926449269 }}

In November 2021, Onew participated in the Korea On Stage project for which he visited and filmed singing performances at Yangdong Folk Village as part of The Cultural Heritage Administration and The Korea Cultural Heritage Foundation's tourist campaign to promote Korea's Cultural Heritage.{{cite web|url=http://www.heraldpop.com/view.php?ud=202111180958534409689_1|script-title=ko:온유-자이언티-선우정아-10CM, 아름다운 문화유산 배경으로 4인 4색 감성 라이브|trans-title=Onew-Zion.T-Sunwoo Jung A-10CM, 4-person, 4-color emotional live with beautiful cultural heritage background|work=heraldpop|date=November 18, 2021|language=ko}} In December 2021, Onew was cast in SM C&C Studio's web variety show Soldier Idol Camp and short-form horror movie 4 Minutes 44 Seconds.{{Cite news |url=https://star.mt.co.kr/stview.php?no=2021120209082850539 |title=샤이니 온유, 배우 변신..'4분 44초' 호러 주인공[공식] |newspaper=스타뉴스 |date=December 2, 2021 |trans-title=SHINee's Onew, transformed into an actor...'4 minutes 44 seconds' horror protagonist [Official] |access-date=June 10, 2022 |language=ko |url-status=live |archive-date=December 2, 2021 |archive-url=https://web.archive.org/web/20211202164107/https://star.mt.co.kr/stview.php?no=2021120209082850539 }} On December 6, 2021, Onew and Punch released a duet, "Way", as part of SM Station. The single featured lyrics written by Onew alongside established songwriter Kim Eana. On December 27, 2021, Onew, alongside labelmates Kyuhyun and Taeil, released the song "Ordinary Day" for SM Entertainment's winter album 2021 Winter SM Town: SMCU Express.{{Cite web|title=규현X온유X태일→예리X닝닝, '2021 윈터 SM타운' 이색 컬래버|url=http://www.celuvmedia.com/article.php?aid=1640217659406205007|access-date=January 18, 2022|website=www.celuvmedia.com|language=ko|archive-date=January 18, 2022|archive-url=https://web.archive.org/web/20220118182719/http://www.celuvmedia.com/article.php?aid=1640217659406205007|url-status=live}}

On February 27, Onew released a song titled "Mind Warning" as a soundtrack for the drama series Forecasting Love and Weather.{{Cite news |url=https://star.mt.co.kr/stview.php?no=2022022510135348739 |title=샤이니 온유, '기상청 사람들' OST 가창..'마음주의보' 27일 발매 |newspaper=스타뉴스 |date=February 25, 2022 |trans-title=SHINee Onew, 'Meteorological Agency People' OST Sing...'Heart Alert' released on the 27th |access-date=June 8, 2022 |language=ko |url-status=live |archive-date=June 8, 2022 |archive-url=https://web.archive.org/web/20220608005426/https://star.mt.co.kr/stview.php?no=2022022510135348739 }} In March, it was announced that Onew would reprise his role as Ha-ram for the 2022 production of Midnight Sun.{{cite web |last1=Lee |first1=Gyu-lee |title=Apink's Kim Nam-joo to make musical debut with 'Midnight Sun' |date=March 24, 2022 |url=https://www.koreatimes.co.kr/www/art/2022/03/690_326088.html |publisher=The Korea Times |access-date=March 24, 2022 |archive-date=March 25, 2022 |archive-url=https://web.archive.org/web/20220325211206/https://www.koreatimes.co.kr/www/art/2022/03/690_326088.html |url-status=live }} In the musical soundtrack released on April 30, Onew participated in two songs, "The Sun is in My Eyes" and a duet, "A Melody Called You", with Kim Nam-joo.{{cite web |title=온유·김남주·하성운 '태양의 노래, 30일 글로벌 음원 발매| date=April 26, 2022 | trans-title=Onew, Kim Nam-joo, Ha Sung-woon 'Song of the Sun, global music release on the 30th |url=https://www.xportsnews.com/article/1567968 |publisher=Xports News |access-date=June 10, 2022 |archive-date=June 10, 2022 |archive-url=https://web.archive.org/web/20220610023558/https://www.xportsnews.com/article/1567968 |language=ko |url-status=live }} On April 11, Onew's second EP, Dice, was released with the lead single of the same name. This marked Onew's first solo comeback after his discharge from the military and his first time promoting as a soloist.{{cite web|url=https://n.news.naver.com/entertain/now/article/108/0003039581|author=Yoon Sang-geun|title=샤이니 온유, 4월 11일 'DICE' 컴백 확정[공식]|trans-title=SHINee's Onew confirmed for 'DICE' comeback on April 11th [Official]|publisher=Star News|via=Naver|date=March 29, 2022|access-date=March 29, 2022|language=ko|url-status=live|archive-date=March 29, 2022|archive-url=https://web.archive.org/web/20220329010702/https://n.news.naver.com/entertain/now/article/108/0003039581}} He stated that he sought diversity with this EP; like the six-faced object, it consists of six tracks showing different aspects of him as a soloist.{{cite web |title=SHINee leader Onew says 'diversity' is keyword for his new EP |date=April 11, 2022 |url=https://www.koreatimes.co.kr/www/art/2022/04/732_327135.html |publisher=The Korea Times |access-date=June 10, 2022 |archive-date=May 5, 2022 |archive-url=https://web.archive.org/web/20220505204816/http://www.koreatimes.co.kr/www/art/2022/04/732_327135.html |url-status=live }} One of the tracks is "In the Whale", a special song showing his affection and gratefulness to fans, which Onew wrote lyrics for.{{cite news|url=http://osen.mt.co.kr/article/G1111803339|script-title=ko:샤이니 온유, 솔로 수록곡 'In the whale' 작사..팬들 향한 마음|trans-title=SHINee's Onew writes lyrics for solo track 'In the whale'... A heart for fans|work=Osen|access-date=June 12, 2022|date=April 3, 2022|language=ko|archive-date=June 12, 2022|archive-url=https://web.archive.org/web/20220612010034/http://osen.mt.co.kr/article/G1111803339|url-status=live}}

As a pre-release of his Japanese debut album, Onew released a digital EP, Who Sings? Vol.1, on June 1. The EP includes four cover songs: Kazumasa Oda's "Kirakira", which was released on May 18, Motohiro Hata's "Uroko", which was released on May 25, Misia's "Everything", and Dreams Come True's "Yasashii Kissete".{{Cite web|url=https://shinee.jp/news/2022/0513_1915.html|script-title=ja:ONEW デジタルEP『Who sings? Vol.1』の先行配信が決定＆デジタルキャンペーンの実施も決定|website=SHINee Japan Official|language=ja|access-date=May 13, 2022|archive-date=May 13, 2022|archive-url=https://web.archive.org/web/20220513090100/https://shinee.jp/news/2022/0513_1915.html|url-status=live |title=SHINee OFFICIAL WEBSITE }} On July 6, Onew released his first Japanese studio album, Life Goes On, with the lead single of the same name, which was pre-released on June 22. Before its physical release, the album was released digitally on June 29. The album contains ten tracks, including six original tracks and the four covers previously included in Who Sings? Vol.1.{{Cite web |date=May 17, 2022 |title=SHINee's ONEW to drop 1st Japanese full album in July and hold solo tour |url=https://m.k-odyssey.com/news/newsview.php?ncode=1065602241433016 |access-date=May 17, 2022 |website=Yonhap News Agency |language=ko |archive-date=May 17, 2022 |archive-url=https://web.archive.org/web/20220517085050/https://m.k-odyssey.com/news/newsview.php?ncode=1065602241433016 |url-status=live }}{{Cite web|url=https://shinee.jp/news/2022/0601_1922.html|script-title=ja:ONEW JAPAN 1st ALBUM『Life goes on』の新ビジュアル＆全形態ジャケット写真を公開！さらに、曲順、曲タイトルも公開！|trans-title=ONEW JAPAN 1st ALBUM "Life goes on" new visuals & all forms jacket photos released! In addition, the song order and song title are also released!|website=SHINee Japan Official|language=ja|access-date=June 7, 2022|archive-date=June 1, 2022|archive-url=https://web.archive.org/web/20220601090223/https://shinee.jp/news/2022/0601_1922.html|url-status=live |title=SHINee OFFICIAL WEBSITE }}{{Cite web|url=https://shinee.jp/news/2022/0621_1941.html|script-title=ja:JAPAN 1st ALBUMからタイトル曲「Life goes on」のデジタル先行配信が決定！さらにデジタルキャンペーンも決定！|trans-title=Digital advance distribution of the title song "Life goes on" has been decided from JAPAN 1st ALBUM! In addition, a digital campaign has been decided!|website=SHINee Japan Official|language=ja|access-date=July 5, 2022|archive-date=June 21, 2022|archive-url=https://web.archive.org/web/20220621091149/https://shinee.jp/news/2022/0621_1941.html|url-status=live |title=SHINee OFFICIAL WEBSITE }} On July 8, he embarked on his first solo concert tour in Japan, starting with a concert at the Nippon Budokan in Tokyo. The tour consisted of eight sold-out concerts stopping at four cities. Six concerts were originally scheduled, with two additional performances added later to accommodate demand, taking place on September 10 and 11 at Yoyogi National Gymnasium in Tokyo.{{cite web|url=https://koreajoongangdaily.joins.com/2022/06/28/entertainment/kpop/korea-onew-shinee/20220628111228072.html|title=Onew adds two more Tokyo dates to Japan concert tour|website=Korea JoongAng Daily|date=June 28, 2022|access-date=July 5, 2022|archive-date=July 4, 2022|archive-url=https://web.archive.org/web/20220704154054/https://koreajoongangdaily.joins.com/2022/06/28/entertainment/kpop/korea-onew-shinee/20220628111228072.html|url-status=live}}{{cite web|url=https://www.oricon.co.jp/news/2242434/full/|title=SHINeeオンユ、初ソロツアーで秦基博とコラボ歌唱 通訳・カンペなしの日本語MCにもファン感激|trans-title=SHINee Onew collaborates with Motohiro Hata on his first solo tour.|publisher=Oricon|language=ja|access-date=July 15, 2022|archive-date=July 15, 2022|archive-url=https://web.archive.org/web/20220715151022/https://www.oricon.co.jp/news/2242434/full/|url-status=live}}{{Cite news |url=https://star.mt.co.kr/foreign/starViewEng.html?no=2022091300486998098 |title=SHINee's Onew, Japan's first solo tour finale |access-date=September 16, 2022 |url-status=live |archive-date=September 12, 2022 |archive-url=https://web.archive.org/web/20220912163125/https://star.mt.co.kr/foreign/starViewEng.html?no=2022091300486998098 |author1=Moneytoday }} On September 9, Onew released his Japanese single titled "Dance Whole Day" which was specially prepared to be performed at his last additional concerts. The single was later released in Korea on September 15.{{Cite web |url=https://www.spotvnews.co.kr/news/articleView.html?idxno=548487 |title=샤이니 온유, 日 솔로 투어 화려한 피날레…전 공연 매진 대성황 |date=September 12, 2022 | trans-title=SHINee's Onew, Japan's solo tour splendid finale... All performances sold out | language=ko |access-date=September 16, 2022 |url-status=live |archive-date=September 16, 2022 |archive-url=https://web.archive.org/web/20220916215621/https://www.spotvnews.co.kr/news/articleView.html?idxno=548487 }} The last concert of the tour was broadcast live on TBS Television.{{cite web|url=https://www.oricon.co.jp/news/2245032/full/|title=SHINeeオンユの代々木第1体育館公演 生中継が決定|date=August 8, 2022 |trans-title=SHINee Onew's Yoyogi 1st Gymnasium performance will be broadcast live|publisher=Oricon|language=ja|access-date=September 2, 2022|archive-date=August 19, 2022|archive-url=https://web.archive.org/web/20220819212443/https://www.oricon.co.jp/news/2245032/full/|url-status=live}}

On December 26, Onew released songs "The Cure" and "Where You Are", collaborating with other labelmates for SM Entertainment's winter album 2022 Winter SM Town: SMCU Palace. "The Cure", which is the album's lead single, shares a message of solidarity with the global movement to combat climate change to embrace a sustainable future.{{cite web |title=이수만 다 계획이 있구나…SM 선한 영향력 '더 큐어', 치유의 힘| trans-title=Lee Soo-man has a plan... SM good influence 'The Cure', healing power |url=https://www.xportsnews.com/article/1669626 |publisher=Xports News |date=December 26, 2022 |archive-date=December 29, 2022 |archive-url=https://web.archive.org/web/20221229023241/https://www.xportsnews.com/article/1669626 |language=ko |url-status=live }}{{Cite news|title='SMTown Live 2023: SMCU Palace @Kwangya!' to be streamed New Year's Day |url=https://koreajoongangdaily.joins.com/2022/12/28/entertainment/kpop/sm-town-sm-town-live-smcu-palace/20221228154157865.html|author=Yim Seung-hye|date=December 28, 2022|archive-date=December 28, 2022|archive-url=https://web.archive.org/web/20221228093250/https://koreajoongangdaily.joins.com/2022/12/28/entertainment/kpop/sm-town-sm-town-live-smcu-palace/20221228154157865.html|url-status=live}}

On January 26, it was announced that Onew would hold his first Korean concert, titled O-New-Note, at the Olympic Hall in Seoul on March 4–5.{{Cite news|title=Onew of SHINee to hold first solo concerts in March |url=https://koreajoongangdaily.joins.com/2023/01/26/entertainment/kpop/Korea-Kpop-SHINee/20230126130431449.html|author=Cho Yong-jun|date=January 26, 2023|archive-date=January 26, 2023|archive-url=https://web.archive.org/web/20230126124903/https://koreajoongangdaily.joins.com/2023/01/26/entertainment/kpop/Korea-Kpop-SHINee/20230126130431449.html|url-status=live}} An additional concert on March 3 was later added after tickets were sold out upon release.{{Cite news|url=https://www.koreaherald.com/view.php?ud=20230213000774|title=[Today's K-pop] SHINee's Onew adds date to 1st solo concert|date=February 13, 2023|first=You-mee|last=Hwang|archive-date=February 17, 2023|archive-url=https://web.archive.org/web/20230217020624/https://www.koreaherald.com/view.php?ud=20230213000774|url-status=live}} The last day of the concert was live-streamed globally online through Beyond Live and was simultaneously watched in 74 regions around the world.{{cite news|url=http://osen.mt.co.kr/article/G1112054573|script-title=ko:샤이니 온유, 첫 솔로 콘서트 'O-NEW-NOTE'도 성료..오늘(6일) 컴백|trans-title=SHINee Onew's first solo concert 'O-NEW-NOTE' was successfully completed.. Comeback today (6th)|work=Osen|date=March 6, 2023|access-date=March 17, 2023|language=ko|archive-date=March 17, 2023|archive-url=https://web.archive.org/web/20230317010905/http://osen.mt.co.kr/article/G1112054573|url-status=live}} On March 6, Onew released his first Korean studio album, Circle, with the lead single "O (Circle)". The album contains ten songs in which he tried different methods of singing, exhibiting his musical tastes rather than showing off what he can do. He chose the words "healing," "recovery" and "circulation" as the album's keywords.{{cite web|url=https://www.nme.com/news/music/shinee-onew-release-new-solo-album-comeback-march-3398143|title=Shinee's Onew announces first solo studio album 'Circle'|website=NME|last=Yeo|first=Gladys|date=February 21, 2023|access-date=February 25, 2023}}{{cite web|title=SHINee's Onew to drop 1st individual studio album|date=March 6, 2023 |url=https://www.koreatimes.co.kr/www/art/2023/03/732_346578.html|publisher=The Korea Times|access-date=March 17, 2023|archive-date=March 17, 2023|archive-url=https://web.archive.org/web/20230317010446/https://www.koreatimes.co.kr/www/art/2023/03/732_346578.html|url-status=live}} On March 14–15, Onew held his concert O-New-Note in Japan at the Yoyogi National Gymnasium in Tokyo attracting 22,000 people. At the concert, he sang a new unreleased Japanese single titled "Inspiration".{{cite news|url=http://osen.mt.co.kr/article/G1112061439|script-title=ko:샤이니 온유, 日 콘서트 2만 2천 관객 열광..변함 없는 인기|trans-title=SHINee's Onew, 22,000 Japanese concert fans enthusiastic.. Unwavering popularity|work=Osen|date=March 16, 2023|access-date=March 17, 2023|language=ko|archive-date=March 17, 2023|archive-url=https://web.archive.org/web/20230317031228/http://osen.mt.co.kr/article/G1112061439|url-status=live}} On March 18, Onew received his first music show win as a solo artist on MBC's Show! Music Core.{{cite news|url=https://www.newsen.com/news_view.php?uid=202303181540402510|script-title=ko:'음악중심' 샤이니 온유, 출연 없이 1위‥엑소 카이·트와이스 컴백[종합]|trans-title=Shinee's Onew won first place on "Music Core" without attending... Exo's Kai and Twice comeback [Roundup]|work=Newsen|access-date=March 18, 2023|date=March 18, 2023|language=ko|archive-date=March 18, 2023|archive-url=https://web.archive.org/web/20230318092849/https://www.newsen.com/news_view.php?uid=202303181540402510|url-status=live}} On March 22, both "Inspiration" and another Japanese single titled "Knock On My Door" were released digitally.{{cite web|url=https://www.billboard-japan.com/d_news/detail/123024/2|script-title=ja:オンユ（SHINee）、日本ソロ公演で日本語の新曲など披露「SHINeeの活動も準備中」|trans-title=Onew (SHINee) shows off new Japanese songs at solo performance in Japan "SHINee's activities are also being prepared"|work=Billboard Japan|date=March 16, 2023|access-date=March 17, 2023|language=ja|archive-date=March 17, 2023|archive-url=https://web.archive.org/web/20230317033200/https://www.billboard-japan.com/d_news/detail/123024/2|url-status=live}}

On June 9, it was announced that Onew would be unable to participate in the Korean concert of Shinee's tour, Shinee World VI: Perfect Illumination, and promotions for their eighth studio album due to health issues.{{cite web|url=https://koreajoongangdaily.joins.com/2023/06/09/entertainment/kpop/Onew-OnewSHINee-SHINee/20230609161813557.html|title=SHINee's Onew to take break due to 'health issues'|website=Korea JoongAng Daily|last=So-yeon|first=Yoon|date=June 9, 2023|archive-date=June 9, 2023|archive-url=https://web.archive.org/web/20230609130422/https://koreajoongangdaily.joins.com/2023/06/09/entertainment/kpop/Onew-OnewSHINee-SHINee/20230609161813557.html|url-status=live}}{{cite web|url=https://www.nme.com/news/music/shinees-onew-hiatus-health-issues-3453512|title=SHINee's Onew to go on hiatus due to "health issues"|website=NME|last=Ziwei|first=Puah|date=June 9, 2023|archive-date=June 9, 2023|archive-url=https://web.archive.org/web/20230609132528/https://www.nme.com/news/music/shinees-onew-hiatus-health-issues-3453512|url-status=live}} It was later announced that he would also sit out of the Japanese dates of the tour.{{Cite news|url=https://www.oricon.co.jp/news/2293071/full/|script-title=ja:SHINeeオンユ、日本アリーナツアー不参加「回復に集中するため」 6月から活動休止中|trans-title=SHINee's Onew will not be participating in the Japan arena tour "to focus on recovery", hiatus from June|work=Oricon|location=Minato, Tokyo|language=ja|date=August 31, 2023}} Onew revealed later that he had a throat surgery during his hiatus, stating: "There were psychological issues, but the physical issues were bigger. That's why I lost a lot of weight."{{cite web|url=http://www.heraldpop.com/view.php?ud=202408290901345744049_1|script-title=ko:[팝인터뷰②]SM 떠난 온유 "안주한 느낌 들어 새 도전..몸 아플 때 실패하는 법 배웠다"|trans-title=[Pop Interview②] Onew, who left SM, "Feels settled, takes on a new challenge... I learned how to fail when I'm sick"|work=heraldpop|date=September 3, 2024|language=ko|archive-date=September 3, 2024|archive-url=https://web.archive.org/web/20240903014954/http://www.heraldpop.com/view.php?ud=202408290901345744049_1|url-status=live}}

On April 3, it was announced that Onew had signed with a new agency, Griffin Entertainment, for his solo activities after his contract with SM Entertainment ended in late March. His group activities with Shinee will remain unchanged under SM.{{cite web|url=https://n.news.naver.com/entertain/article/003/0012467863|script-title=ko:SM 떠난 온유, 신생기획사 그리핀 '1호 아티스트'|trans-title=Onew, who left SM, is 'first artist' by new agency Griffin|website=Newsis|via=Naver|last=Lee|first=Jae-hoon|date=April 3, 2024|access-date=April 3, 2024|language=ko}}{{Cite news|title=SHINee's Onew signs with newly-created Griffin Entertainment|url=https://celebconfirmed.com/news/shinees-onew-signs-with-newly-created-griffin-entertainment-12243|website=celebconfirmed|last=Kim|first=Juyeon|date=April 3, 2024|access-date=April 4, 2024|archive-date=April 4, 2024|archive-url=https://web.archive.org/web/20240404011332/https://celebconfirmed.com/news/shinees-onew-signs-with-newly-created-griffin-entertainment-12243|url-status=live}} On April 21, Onew made his first public appearance after about 10 months health hiatus performing at the 2024 Star Awards in Singapore.{{cite web|url=https://www.asiaone.com/entertainment/i-wont-stop-challenging-myself-shinees-onew-lee-jin-ki-makes-1st-public-appearance-10-months-star-awards-2024|title='I won't stop challenging myself': Shinee's Onew makes 1st public appearance in 10 months at Star Awards 2024|website=AsiaOne|last=Nadhirah|first=Syarifah|date=April 21, 2024|archive-date=April 21, 2024|archive-url=https://web.archive.org/web/20240421155604/https://www.asiaone.com/entertainment/i-wont-stop-challenging-myself-shinees-onew-lee-jin-ki-makes-1st-public-appearance-10-months-star-awards-2024|url-status=live}} On May 17, Onew embarked on his first-ever solo Asian fan meeting tour, titled Guess!, with a performance at Sejong University Daeyang Hall in Seoul.{{Cite news|title=SHINee member Onew to hold first solo fan meet next month|url=https://koreajoongangdaily.joins.com/news/2024-04-10/entertainment/kpop/SHINee-member-Onew-to-hold-first-solo-fan-meet-next-month/2022229|website=Korea JoongAng Daily|last=Lee|first=Jian|date=April 10, 2024|access-date=April 10, 2024|archive-date=April 10, 2024|archive-url=https://web.archive.org/web/20240410050429/https://koreajoongangdaily.joins.com/news/2024-04-10/entertainment/kpop/SHINee-member-Onew-to-hold-first-solo-fan-meet-next-month/2022229|url-status=live}} He performed a new unreleased song titled "All Day".{{cite news|url=http://www.osen.co.kr/article/G1112339127|script-title=ko:샤이니 온유, 첫 단독 팬미팅 'GUESS!' 성료.."늘 감사함 느끼고 있다"|trans-title=SHINee Onew, the first solo fan meeting "GUESS!" was completed... "I'm always thankful."|work=Osen|date=May 20, 2024|language=ko|archive-date=May 20, 2024|archive-url=https://web.archive.org/web/20240520222406/http://www.osen.co.kr/article/G1112339127|url-status=live}} The tour was originally scheduled to have six performances in Seoul, Osaka, and Yokohama, but additional performances in Macau, Manila, Kaohsiung, Singapore and Kuala Lumpur were added later to accommodate demand.{{cite news|url=https://www.newsen.com/news_view.php?uid=202404231142150410|script-title=ko:'활동 재개' 샤이니 온유, 韓·日 팬미팅 추가 오픈…거침없는 글로벌 행보|trans-title='Resumption of activities' SHINee's Onew opens additional fan meetings in Korea and Japan… Unstoppable global movement|date=April 23, 2024|language=ko|archive-date=April 25, 2024|archive-url=https://web.archive.org/web/20240425214447/https://www.newsen.com/news_view.php?uid=202404231142150410|url-status=live |newspaper='활동 재개' 샤이니 온유, 韓·日 팬미팅 추가 오픈…거침없는 글로벌 행보 - 손에 잡히는 뉴스 눈에 보이는 뉴스 - 뉴스엔 }}{{cite news|url=https://www.newsen.com/news_view.php?uid=202404300806120410|script-title=ko:샤이니 온유, 단독 팬미팅 亞 5개 지역 추가 개최…글로벌 행보|trans-title=SHINee's Onew holds exclusive fan meeting in 5 additional regions... global move|date=April 30, 2024|language=ko|archive-date=April 30, 2024|archive-url=https://web.archive.org/web/20240430001538/https://www.newsen.com/news_view.php?uid=202404300806120410|url-status=live |newspaper=샤이니 온유, 단독 팬미팅 亞 5개 지역 추가 개최…글로벌 행보 - 손에 잡히는 뉴스 눈에 보이는 뉴스 - 뉴스엔 }} The Kuala Lumpur stop was later cancelled due to unforeseen circumstances from the local promoter.{{Cite tweet|number=1813393187723174287|user=ONEW_GRIFFIN|title=2024 Onew Fanmeeting in Malaysia cancelled|date=July 17, 2024}} The tour was concluded on July 21 with a total of twelve performances in seven Asian cities.{{cite news|url=https://www.osen.co.kr/article/G1112381588|script-title=ko:샤이니 온유, 亞 팬미팅 투어 'GUESS!' 성료.."온유다운 길 가겠다"|trans-title=SHINee's Onew, fan meeting tour 'GUESS!' Success... "I'm going to go down the Onew-like path." |work=Osen|date=July 22, 2024|language=ko|archive-date=July 22, 2024|archive-url=https://web.archive.org/web/20240722133654/https://www.osen.co.kr/article/G1112381588|url-status=live}} Onew resumed his activities with Shinee, joining their encore concert Shinee World VI Perfect Illumination: Shinee's Back, which was held at the Inspire Arena in Incheon on May 24–26, celebrating their 16th debut anniversary.{{cite web|url=https://www.newsis.com/view/?id=NISX20240413_0002698170&cID=10601&pID=10600|script-title=ko:샤이니, '온유 복귀' 완전체 재개…내달 앙코르 콘서트|trans-title=SHINee, 'Onew's return' as a full group… Encore concert next month|website=Newsis|date=April 13, 2024|access-date=April 13, 2024|language=ko|archive-date=April 13, 2024|archive-url=https://web.archive.org/web/20240413135215/https://www.newsis.com/view/?id=NISX20240413_0002698170&cID=10601&pID=10600|url-status=live}}{{Cite news|url=https://www.koreaherald.com/view.php?ud=20240527050569|title=[Herald Review] Shinee wraps up 6th world tour with Onew back from hiatus|date=May 27, 2024|first=Hong|last=Yoo|archive-date=May 27, 2024|archive-url=https://web.archive.org/web/20240527204056/https://www.koreaherald.com/view.php?ud=20240527050569|url-status=live}} After being crowned as Best Song Stealer on MBC's Song Stealer, Onew's cover of Byul's debut song "December 32 Days" was digitally released on June 24.{{cite web|url=https://enews.imbc.com/News/RetrieveNewsInfo/421763|script-title=ko:'송스틸러' 샤이니 온유만의 감성 듬뿍 '12월 32일' 음원 출시|trans-title='Song Stealer' SHINee Onew's emotional 'December 32nd' song released|website=MBC|date=June 24, 2024|language=ko|archive-date=July 6, 2024|archive-url=https://web.archive.org/web/20240706000427/https://enews.imbc.com/News/RetrieveNewsInfo/421763|url-status=live}} Onew released "All Day" as a single on July 15.{{cite web |title=Onew of Shinee to release solo EP in September |url=https://www.koreaherald.com/view.php?ud=20240711050633|website=The Korea Herald|last=Hong|first=Yoo|date=July 11, 2024|archive-date=July 17, 2024|archive-url=https://web.archive.org/web/20240717133922/http://www.koreaherald.com/view.php?ud=20240711050633|url-status=live}}{{cite news|url=https://www.newsen.com/news_view.php?uid=202407150704532410|script-title=ko:샤이니 온유, 오늘(15일) 신곡 '월화수목금토일' 발매…작사 참여|trans-title=SHINee Onew, new song 'Mon Tue Wed Thu Fri Sat Sun' released today (15th)… participated in writing lyrics|work=Newsen|date=July 15, 2024|language=ko|archive-date=August 14, 2024|archive-url=https://web.archive.org/web/20240814001024/https://www.newsen.com/news_view.php?uid=202407150704532410|url-status=live}}

On September 3, Onew released his third EP, Flow, with the lead single "Beat Drum". The album, for which he participated in producing and writing the lyrics for all its tracks, contains six songs including the pre-released single "All Day".{{cite web|url=https://news.koreaherald.com/view.php?ud=20240902050735|title=[Herald Interview] Onew of SHINee steps outside comfort zone|website=The Korea Herald|last=Hong|first=You|date=September 3, 2024|archive-date=September 3, 2024|archive-url=https://web.archive.org/web/20240903191005/https://news.koreaherald.com/view.php?ud=20240902050735|url-status=live}} He mentioned that while his previous album, Circle, centered around the themes of life's cycles, Flow focuses on the movement within these cycles and how people should do their best in those situations while still preserving their unique identities and that he tried to choose songs that everyone can easily sing along to and enjoy at a concert aiming to be closer to the public.{{cite web|url=https://www.koreatimes.co.kr/www/art/2024/09/398_381705.html|title=[INTERVIEW] Onew finds greatest joy in performing for his fans|website=The Korea Times|last=Pyo|first=Kyung-min|date=September 3, 2024|archive-date=September 3, 2024|archive-url=https://web.archive.org/web/20240903191001/https://www.koreatimes.co.kr/www/art/2024/09/398_381705.html|url-status=live}} On October 5–6, Onew held his fan concert, titled Hola!, at the SK Olympic Handball Gymnasium in Seoul with the last day live-streamed globally online through Fromm platform.{{cite news|url=https://www.newsen.com/news_view.php?uid=202410071056540410|script-title=ko:샤이니 온유, 초록빛 팬콘 대성황 "오히려 응원 받은 기분"|trans-title=SHINee Onew, Green Fancon is a great success "I feel like I was cheered on"|date=October 4, 2024|language=ko|archive-date=November 5, 2024|archive-url=https://web.archive.org/web/20241105003533/https://www.newsen.com/news_view.php?uid=202410071056540410|url-status=live |newspaper=샤이니 온유, 초록빛 팬콘 대성황 "오히려 응원 받은 기분" - 손에 잡히는 뉴스 눈에 보이는 뉴스 - 뉴스엔 }} Additionally, he held the fan concert in Taipei on November 2 and in Yokohama on November 21–22.{{cite web |title=SHINee's ONEW confirms comeback in September with 'FLOW'|url=https://www.gmanetwork.com/entertainment/showbiznews/news/115045/shinees-onew-confirms-comeback-in-september-with-flow/story|website=GMA Network|date=August 13, 2024|last=Cruz|first=Hazel|archive-date=August 14, 2024|archive-url=https://web.archive.org/web/20240814003453/https://www.gmanetwork.com/entertainment/showbiznews/news/115045/shinees-onew-confirms-comeback-in-september-with-flow/story|url-status=live}}{{cite web|url=http://www.heraldpop.com/view.php?ud=202409251331026411149_1|script-title=ko:온유, 타이베이서 팬콘서트 추가 개최..글로벌 광폭 행보|trans-title=Onew, additional fan concert held in Taipei.. global wide-ranging steps|work=heraldpop|date=September 25, 2024|language=ko|archive-date=September 26, 2024|archive-url=https://web.archive.org/web/20240926073719/http://www.heraldpop.com/view.php?ud=202409251331026411149_1|url-status=live}} The last performance was broadcast later on Wowow.{{cite web|script-title=ja:SHINeeオンユ：横浜で開催した初のファンコンサートがWOWOWで2月放送・配信|trans-title=SHINee's Onew: First fan concert held in Yokohama to be broadcast and streamed on WOWOW in February |url=https://mantan-web.jp/article/20250114dog00m200054000c.html|website=Mantan Web|language=ja|date=January 14, 2025|archive-date=January 16, 2025|archive-url=https://web.archive.org/web/20250116133930/https://mantan-web.jp/article/20250114dog00m200054000c.html|url-status=live}}

On November 6, Onew released a song titled "For You" as a soundtrack for the popular webtoon No Office Romance!.{{cite news|url=http://www.osen.co.kr/article/G1112451718|script-title=ko:온유, 오늘(6일) 인기 로맨스 웹툰 '사내연애 사절!' OST 발매|trans-title=Onew, today (6th) releases the OST for the popular romance webtoon 'No Office Romance!'|work={{ill|Osen (newspaper)|ko|OSEN|lt=OSEN}}|date=November 6, 2024|language=ko|archive-date=November 6, 2024|archive-url=https://web.archive.org/web/20241106014632/http://www.osen.co.kr/article/G1112451718|url-status=live}} On December 12, Onew released the single "Yay", serving as a pre-release for his upcoming album.{{cite news|url=http://www.osen.co.kr/article/G1112472454|script-title=ko:땅속 깊은 굴에서 탈출한 샤이니 온유, 오늘(12일) '만세' 선공개|trans-title=SHINee Onew, who escaped from a deep cave underground, pre-releases 'Manse' today (12th)|work={{ill|Osen (newspaper)|ko|OSEN|lt=OSEN}}|date=December 12, 2024|language=ko|archive-date=December 16, 2024|archive-url=https://web.archive.org/web/20241216193800/http://www.osen.co.kr/article/G1112472454|url-status=live}} Onew held his first offline birthday party since debut, O! New Day, on December 14, at KBS Arena.{{cite news|url=http://www.osen.co.kr/article/G1112446029|script-title=ko:온유, 12월 14일 생일 파티 'O! NEW DAY' 개최..찡구들과 특별한 시간|trans-title=Onew, December 14th birthday party 'O! NEW DAY' held.. Special time with JJingus|work={{ill|Osen (newspaper)|ko|OSEN|lt=OSEN}}|date=October 28, 2024|language=ko|archive-date=November 5, 2024|archive-url=https://web.archive.org/web/20241105005213/http://www.osen.co.kr/article/G1112446029|url-status=live}}

On January 6, 2025, Onew released his fourth EP, Connection, with the lead single "Winner". The album contains six songs including the pre-released single "Yay". Once again, Onew participated in this album's entire production and lyric writing with the goal of it being the connecting bridge to project and express his values, especially happiness, to listeners and comfort them.{{cite news|url=http://www.osen.co.kr/article/G1112479712|script-title=ko:온유, 전곡 프로듀싱→작사 참여..타이틀곡은 'Winner'|trans-title=Onew, produced all the songs → participated in writing the lyrics.. Title song is 'Winner'|work={{ill|Osen (newspaper)|ko|OSEN|lt=OSEN}}|date=December 27, 2024|language=ko|archive-date=December 30, 2024|archive-url=https://web.archive.org/web/20241230194619/http://www.osen.co.kr/article/G1112479712|url-status=live}}{{cite web|script-title=ko:온유, 자체 콘텐츠서 밝힌 미니 4집 비하인드 "가장 중요한 '행복'의 가치 표현"|trans-title=Onew, behind-the-scenes story of 4th mini album revealed through own content "expressing the most important value of 'happiness'"|url=https://www.starnewskorea.com/stview.php?no=2025011309232658340|work=starnewskorea|date=January 13, 2025|archive-date=February 3, 2025|archive-url=https://web.archive.org/web/20250203221805/https://www.starnewskorea.com/stview.php?no=2025011309232658340|url-status=live}} He embarked on his concert tour titled, Onew the Live: Connection, starting the Asia leg with two concerts at the Yokohama Arena in Japan on February 15–16, 2025, followed by performances in Korea, Taiwan, and finally Macau on April 20, 2025.{{Cite web |last=Yoon |first=So-yeon |date=2024-12-16 |title=Onew to release fourth EP 'Connection' on Jan. 6 |url=https://koreajoongangdaily.joins.com/news/2024-12-16/entertainment/kpop/Onew-to-release-new-album-Connection-on-Jan-6/2201408 |access-date=2024-12-17 |website=Korea JoongAng Daily |language=en |archive-date=December 16, 2024|archive-url=https://web.archive.org/web/20241216010836/https://koreajoongangdaily.joins.com/news/2024-12-16/entertainment/kpop/Onew-to-release-new-album-Connection-on-Jan-6/2201408|url-status=live}}{{cite news|url=http://www.osen.co.kr/article/G1112511122|script-title=ko:샤이니 온유, 과거·현재·미래 총망라…역대급 스케일 단독 콘서트 성료|trans-title=SHINee Onew, past, present, and future all encompassing… A solo concert of unprecedented scale successfully completed|work={{ill|Osen (newspaper)|ko|OSEN|lt=OSEN}}|date=February 24, 2025|language=ko|archive-date=February 24, 2025|archive-url=https://web.archive.org/web/20250224215832/http://www.osen.co.kr/article/G1112511122|url-status=live}} The American leg of the tour covered eight U.S. cities starting with New York on April 24, 2025 and wrapping up in Los Angeles on May 9, 2025.{{cite news|url=https://www.osen.co.kr/article/G1112513556|script-title=ko:온유, 4월 솔로 첫 미주 투어 돌입..글로벌 활동 반경 확장|trans-title=Onew to Begin First Solo Tour in America in April… Expanding Global Activity Radius|work={{ill|Osen (newspaper)|ko|OSEN|lt=OSEN}}|date=February 27, 2025|language=ko|archive-date=February 27, 2025|archive-url=https://web.archive.org/web/20250227021426/http://www.osen.co.kr/article/G1112513556|url-status=live}}{{cite web|url=https://www.newsen.com/news_view.php?uid=202505120926450410|script-title=ko:샤이니 온유, 미주 투어 성공적 마무리→7월 정규 2집 발매|trans-title=SHINee Onew, America Tour Successfully Concludes → 2nd Full Album Released in July|work=Newsen|access-date=May 12, 2025|date=May 12, 2025|language=ko|archive-date=May 12, 2025|archive-url=https://web.archive.org/web/20250512022730/https://www.newsen.com/news_view.php?uid=202505120926450410|url-status=live}}

On March 7, 2025, Onew hosted a special concert titled, Onew's Spring Songs, at the {{ill|Tokyo Garden Theater|ja|東京ガーデンシアター}} in Japan in which {{ill|Wolf Howl Harmoney|ja|WOLF HOWL HARMONY from EXILE TRIBE}} performed as a guest.{{cite web|url=https://www.billboard-japan.com/d_news/detail/146259/2|script-title=ja:SHINeeオンユ／WOLF HOWL HARMONYが出演、春の名曲を届けるスペシャルステージ【オンユの春うた】|trans-title=SHINee's Onew/WOLF HOWL HARMONY will perform on a special stage to deliver spring hits [Onew's Spring Songs]|work=Billboard Japan|date=February 7, 2025|access-date=February 7, 2025|language=ja|archive-date=February 7, 2025|archive-url=https://web.archive.org/web/20250207172041/https://www.billboard-japan.com/d_news/detail/146259/2|url-status=live}} The concert was broadcast later on TBS Television.{{cite web |url=https://www.hwaiting.me/news/read/94571.html|script-title=ja:=【オフィシャルレポート】暖かい春の風を僕の歌で感じて〜「オンユの春うた」開催|trans-title=[Official Report] Feel the warm spring breeze with my songs ~ "Onew's Spring Songs" held|date=March 7, 2025|work=Hwaiting|language=ja|archive-date=March 8, 2025|archive-url=https://web.archive.org/web/20250308045625/https://www.hwaiting.me/news/read/94571.html|url-status=live}} On 21 April, 2025, Onew released his first-ever English song "Mad" serving as a pre-release for his upcoming second Korean studio album which will be released in July, 2025.{{Cite web|title=Onew to Release First English Song 'MAD' on April 21|url=https://www.starnewskorea.com/foreign/starViewEng.html?no=2025032417596967256|work=STARNEWS|date=March 24, 2025|archive-date=March 24, 2025|archive-url=https://web.archive.org/web/20250324165319/https://www.starnewskorea.com/foreign/starViewEng.html?no=2025032417596967256|url-status=live}}{{Cite news|url=https://www.koreaherald.com/article/10459577|title=SHINee’s Onew confirms July return|date=April 7, 2025|first=You-mee|last=Hwang|archive-date=April 7, 2025|archive-url=https://web.archive.org/web/20250407174157/https://www.koreaherald.com/article/10459577|url-status=live}}

Onew is an only child. He became interested in music at a young age when he started to play the piano. Later, his passion inspired him to pursue a career in the music industry.

Onew graduated from the Gwangmyeong Information Industry High School. In his senior year, he ranked second in his grade and held the highest national score for his high school SATs exam. He started attending Chungwoon University, majoring in broadcasting music. After receiving his bachelor's degree he continued to attend the university for his master's degree which he earned in practical music.{{Cite news|date=November 8, 2018|title=소지섭과 '슈주' 배출한 청운대학교, '유명인 산실'|language=ko|trans-title=Chungwoon University, which produced So Ji-sub and 'Shuju', 'the birthplace of celebrities'|work=Sports G|url=https://www.sports-g.com/2018/11/08/%EC%86%8C%EC%A7%80%EC%84%AD%EA%B3%BC-%EC%8A%88%EC%A3%BC-%EB%B0%B0%EC%B6%9C%ED%95%9C-%EC%B2%AD%EC%9A%B4%EB%8C%80%ED%95%99%EA%B5%90-%EC%9C%A0%EB%AA%85%EC%9D%B8-%EC%82%B0|archive-url=https://web.archive.org/web/20210605060216/https://www.sports-g.com/2018/11/08/%EC%86%8C%EC%A7%80%EC%84%AD%EA%B3%BC-%EC%8A%88%EC%A3%BC-%EB%B0%B0%EC%B6%9C%ED%95%9C-%EC%B2%AD%EC%9A%B4%EB%8C%80%ED%95%99%EA%B5%90-%EC%9C%A0%EB%AA%85%EC%9D%B8-%EC%82%B0|archive-date=June 5, 2021|url-status=live}}

Onew is one of the main vocalists of Shinee and is known for his distinctively unique vocal color and for his calm and understated voice, providing the strong vocal foundation of the group with fellow member Jonghyun.{{cite news|url=http://www.beffreport.com/news/articleView.html?idxno=4999 |title=[듀엣을부탁해] 샤이니 온유-종현, 다름의 미학을 노래하다 |trans-title=(Duet Request) Shinee's Onew – Jonghyun, sing the aesthetic of "contrast". |website=Beff Report |first=Joo-hyun |last=Kim |date=March 11, 2016 |archive-url=https://web.archive.org/web/20161027211752/http://www.beffreport.com/news/articleView.html?idxno=4999 |archive-date=October 27, 2016|url-status=dead }} In June 2014, Onew underwent a vocal cord polyp removal and vocal fold mucosa reconstruction operation, which made him unable to sing for a few months.{{cite web|url=http://news.mt.co.kr/mtview.php?no=2014061021103668172|script-title=ko:샤이니 온유, "성대 수술 후 퇴원…당분간 통원 치료"|trans-title=SHINee's Onew "patient discharged after vocal surgery ... outpatient treatment for the time being."|access-date=June 10, 2014|language=ko|archive-url=https://web.archive.org/web/20140714184842/http://news.mt.co.kr/mtview.php?no=2014061021103668172|archive-date=July 14, 2014|author=Park, Kyung-ran|url-status=dead}} In December 2014, Kim Yeon-woo, Onew's vocal coach, revealed during a radio broadcast that Onew's condition had improved after the surgery. He also confirmed that Onew's vocal range "improved and he can make sounds comfortably too".{{cite web|url=http://mwave.interest.me/enewsworld/en/article/83534/snsd-sunny-says-shinee-onew-worried-about-his-life-as-singer-after-surgery|title=SNSD Sunny Says SHINee Onew Worried About His Life as Singer After Surgery|access-date=October 29, 2014|author=Jung, Yea-won|website=Mwave|archive-url=https://web.archive.org/web/20141219152652/http://mwave.interest.me/enewsworld/en/article/83534/snsd-sunny-says-shinee-onew-worried-about-his-life-as-singer-after-surgery|archive-date=December 19, 2014|url-status=dead}}

In order to support Onew in the musical Rock of Ages, in 2010, his fans had donated 1.44 tons of rice, a common practice for fans in South Korea, with the expectation that the idol will then donate to a charity of their choice—Onew donated it to help feed North Korean children, which was prepared by the Child Development Program.{{cite web|url=http://bntnews.hankyung.com/apps/news?popup=0&nkey=201010210912433&c1=04&c2=04&nid=04&mode=sub_view|script-title=ko:샤이니 온유, 사랑의 쌀 1.44톤 北 어린이에게 기증|trans-title=Shinee's Onew donates 1.44 ton of rice to North Korean children in need|date=October 21, 2010|access-date=June 19, 2016|language=ko|archive-url=https://web.archive.org/web/20160303192427/http://bntnews.hankyung.com/apps/news?popup=0&nkey=201010210912433&c1=04&c2=04&nid=04&mode=sub_view|archive-date=March 3, 2016|website=BNT News}} Onew also donated 770 kg of rice to children in need in South Korea in May 2010. In 2016, Onew donated roughly 1.2 million won to the Korean Heart Association.{{cite web|url=http://entertain.naver.com/read?oid=001&aid=0008204088|script-title=ko:샤이니 온유 팬클럽, 한국심장재단에 후원금 전달|trans-title=SHINee Onew, donations delivered to South Korea Heart Foundation|date=February 23, 2016|access-date=June 19, 2016|language=ko|archive-date=September 24, 2017|archive-url=https://web.archive.org/web/20170924045841/http://entertain.naver.com/read?oid=001&aid=0008204088|url-status=live}}

In August 2017, Onew was accused of sexual harassment. The victim stated that on August 12 in a night club in Gangnam, Onew, who was intoxicated, touched her leg two or three times as he tried to stand up, over the course of two hours while she was dancing on one of the club's multiple dancing platforms that was adjacent to where Onew was seated.{{Cite news|url=http://sports.chosun.com/news/news.htm?id=201708170100145370010556&ServiceDate=20170816|title=SM 측 "온유 성추행 오해, 상대여성 해프닝 인지후 고소취하" (공식입장 전문)|trans-title=SM, "misunderstanding of sexual harassment, on the other hand, the woman dropped charges" (official position)|date=August 16, 2017|work=Naver|access-date=August 16, 2017|language=ko|archive-date=August 16, 2017|archive-url=https://web.archive.org/web/20170816105221/http://sports.chosun.com/news/news.htm?id=201708170100145370010556&ServiceDate=20170816|url-status=live}}{{Cite news|url=https://www.koreadispatch.com/2017/08/13/details-of-shinee-onew-sexual-harassment-incident/|title=Details of SHINEE Onew Sexual Harassment Incident|date=August 13, 2017|work=Korean Dispatch|access-date=April 10, 2018|archive-date=June 12, 2018|archive-url=https://web.archive.org/web/20180612140806/https://www.koreadispatch.com/2017/08/13/details-of-shinee-onew-sexual-harassment-incident/|url-status=live}} However, she acknowledged that such incidents could happen under the influence of alcohol and withdrew the charge.{{cite news|last1=Jun|first1=Won|title=SM 측 "온유 성추행 오해, 상대여성 해프닝 인지후 고소취하" (공식입장 전문)|url=http://www.xportsnews.com/jenter/?ac=article_view&entry_id=882674&_REFERER=http%3A%2F%2Fentertain.naver.com%2Fread%3Foid%3D311%26aid%3D0000763764|access-date=April 6, 2018|work=Xports News|date=August 12, 2017|language=ko|archive-date=April 6, 2018|archive-url=https://web.archive.org/web/20180406163631/http://www.xportsnews.com/jenter/?ac=article_view&entry_id=882674&_REFERER=http%3A%2F%2Fentertain.naver.com%2Fread%3Foid%3D311%26aid%3D0000763764|url-status=live}} Nevertheless, the case was forwarded to the prosecution as a recommendation for indictment without detention.{{Cite news|url=http://www.yonhapnews.co.kr/bulletin/2017/08/14/0200000000AKR20170814148400004.HTML|title=피해자 "SM 요구로 고소 취소했지만 추행 사실은 변함없어"|trans-title=Shinee Onew's sexual harassment case to be forwarded To prosecution|date=August 14, 2017|work=Yonhap News Agency|access-date=December 5, 2017|language=ko|archive-date=December 6, 2017|archive-url=https://web.archive.org/web/20171206074555/http://www.yonhapnews.co.kr/bulletin/2017/08/14/0200000000AKR20170814148400004.HTML|url-status=live}}{{Cite news|url=http://kpopherald.koreaherald.com/view.php?ud=201712051456116788097_2&ACE_SEARCH=1|title=SHINee's Onew apologizes to fans for sexual harassment allegation|last=Kim|first=So-yeon|date=December 5, 2017|work=Kpop Herald|access-date=December 5, 2017|archive-date=December 6, 2017|archive-url=https://web.archive.org/web/20171206005942/http://kpopherald.koreaherald.com/view.php?ud=201712051456116788097_2&ACE_SEARCH=1|url-status=live}} After a four-month hiatus, Onew posted a letter of apology,{{cite news|last1=Lee|first1=Seung-rok|script-title=ko:[공식 전문] 온유 "팬들께 죄송…샤이니에 걸맞은 사람 될 것" 4개월만에 사과|url=http://www.mydaily.co.kr/new_yk/html/read.php?newsid=201712050248138282&ext=na|access-date=April 6, 2018|work=My Daily|date=December 5, 2017|language=ko|archive-date=April 6, 2018|archive-url=https://web.archive.org/web/20180406164117/http://www.mydaily.co.kr/new_yk/html/read.php?newsid=201712050248138282&ext=na|url-status=live}} which was accepted widely among his fans, but others called for him to step down from Shinee.{{cite news|last1=Baillie|first1=Katie|title=SHINee fans call for Onew to leave K-pop group following apology over sexual harassment claims|url=http://metro.co.uk/2017/12/05/shinee-fans-call-onew-leave-following-apology-sexual-harassment-claims-7133493/|access-date=April 6, 2018|work=Metro|date=December 5, 2017|archive-date=April 6, 2018|archive-url=https://web.archive.org/web/20180406163759/http://metro.co.uk/2017/12/05/shinee-fans-call-onew-leave-following-apology-sexual-harassment-claims-7133493/|url-status=live}} On April 5, 2018, SM Entertainment announced that the charges against him had been dismissed by the prosecutors.{{cite news|last1=Hicap|first1=Jonah|title=Sexual harassment case against SHINee's Onew dismissed|url=http://metro.co.uk/2018/04/06/sexual-harassment-case-against-shinees-onew-dismissed-7445418/|access-date=April 6, 2018|work=Metro|date=April 6, 2018|archive-date=April 6, 2018|archive-url=https://web.archive.org/web/20180406163720/http://metro.co.uk/2018/04/06/sexual-harassment-case-against-shinees-onew-dismissed-7445418/|url-status=live}}{{cite news|last1=Kwak|first1=Hyun-soo|title=SM 측 "샤이니 온유, 강제추행 무혐의 처분" [공식입장]|url=http://sports.donga.com/3/all/20180406/89491411/2|access-date=April 6, 2018|work=Sports Donga|date=April 6, 2018|language=ko|archive-date=April 6, 2018|archive-url=https://web.archive.org/web/20180406163919/http://sports.donga.com/3/all/20180406/89491411/2|url-status=live}}

{{Main|Onew discography}}

{{For|Onew's work with Shinee|Shinee discography}}

Studio albums

• Life Goes On (2022)
• Circle (2023)

{{See also|List of Shinee live performances}}

{{col-begin}}

{{col-2}}

• Life Goes On Tour (2022)
• O-New-Note (2023)
• Onew the Live: Connection (2025){{cite news|url=http://www.osen.co.kr/article/G1112506085|script-title=ko:온유, 日 대규모 아레나 달궜다.."이보다 행복할 수 없어"|trans-title=Onew, Japan's Large Arena Heats Up... "I Couldn't Be Happier Than This"|work={{ill|Osen (newspaper)|ko|OSEN|lt=OSEN}}|date=February 17, 2025|language=ko|archive-date=February 19, 2025|archive-url=https://web.archive.org/web/20250219020512/http://www.osen.co.kr/article/G1112506085|url-status=live}}
• Onew's Spring Songs (2025)

• Onew Fan Concert 'Hola!' (2024){{cite web |title=[Today's K-pop] SHINee's Onew to hold solo concert in Korea, Japan|url=https://news.koreaherald.com/view.php?ud=20240823050534|website=The Korea Herald|last=Hwang|first=You-mee|date=August 23, 2024|archive-date=August 23, 2024|archive-url=https://web.archive.org/web/20240823225210/https://news.koreaherald.com/view.php?ud=20240823050534|url-status=live}}

• Onew Fan Meeting 'Guess!' Asia Tour (2024)
• Onew B-Day Party 'O! New Day' (2024)

• 2024 Star Awards (2024)

• SM Town Live 2022: SMCU Express at Kwangya (2022)
• SM Town Live 2022: SMCU Express at Tokyo (2022)
• SM Town Live 2023: SMCU Palace at Kwangya (2023)

{{col-2}}

• We Are All One – Let's Love K-pop Concert (2022){{cite news|url=https://www.newsen.com/news_view.php?uid=202204190855260410|script-title=ko:샤이니 온유→ITZY 'WE ALL ARE ONE' 콘서트 라인업 공개|trans-title=SHINee Onew → ITZY 'WE ALL ARE ONE' concert lineup revealed|work=Newsen|access-date=July 2, 2022|date=April 19, 2022|language=ko|archive-date=July 2, 2022|archive-url=https://web.archive.org/web/20220702195032/https://www.newsen.com/news_view.php?uid=202204190855260410|url-status=live}}
• Tone & Music Festival (2024){{Cite web|url=https://www.spotvnews.co.kr/news/articleView.html?idxno=673450|script-title=ko:에픽하이→샤이니 온유…'톤앤뮤직 페스티벌 2024', 최종라인업 공개|date=April 22, 2024|trans-title=Epik High → SHINee Onew… 'Tone & Music Festival 2024', final lineup revealed|url-status=live|archive-date=May 1, 2024|archive-url=http://web.archive.org/web/20240501225258/https://www.spotvnews.co.kr/news/articleView.html?idxno=673450 }}
• Beat AX Vol.4 (2024){{cite web|url=https://www.oricon.co.jp/news/2325260/full/|title=日テレフェス『BEAT AX』第4弾は過去最大規模 OMI、FANTASTICS、ATEEZ、岩橋玄樹、ME:Iら10組発表|trans-title=SHINee Onew's Yoyogi 1st Gymnasium performance will be broadcast live|publisher=Oricon|language=ja|date=May 2, 2024|archive-date=May 1, 2024|archive-url=http://web.archive.org/web/20240501221932/https://www.oricon.co.jp/news/2325260/full/|url-status=live}}
• Waterbomb Suwon (2024){{cite news|url=http://www.osen.co.kr/article/G1112412698|script-title=ko:온유, 오늘(7일) '썸데이 페스티벌 2024' 헤드라이너 출격|trans-title=Onew, headliner of 'Someday Festival 2024' today (7th)|work=Osen|date=September 7, 2024|language=ko|archive-date=September 7, 2024|archive-url=https://web.archive.org/web/20240907100510/http://www.osen.co.kr/article/G1112412698|url-status=live}}
• Someday Festival (2024)
• SNU Fall Festival (2024){{cite web|url=http://www.heraldpop.com/view.php?ud=202409261013488483397_1|script-title=ko:온유, 오늘(26일) 데뷔 첫 대학 축제 무대 출격..종횡무진 활약|trans-title=Onew, first college festival stage appearance since debut today (26th)... active in various fields|work=heraldpop|date=September 26, 2024|language=ko|archive-date=September 26, 2024|archive-url=https://web.archive.org/web/20240926073201/http://www.heraldpop.com/view.php?ud=202409261013488483397_1|url-status=live}}
• Idol Radio Live in Tokyo - Shining Moments (2024){{cite web|url=https://www.sponichi.co.jp/entertainment/news/2024/07/31/kiji/20240731c000413K1043000c.html|script-title=ja:SUPER JUNIOR イェソンから福本大晴まで…日韓アーティスト集結！「IDOL RADIO LIVE IN TOKYO」9月に開催|trans-title=From SUPER JUNIOR's Yesung to Fukumoto Taisei...Japanese and Korean artists gather! "IDOL RADIO LIVE IN TOKYO" to be held in September|website=Sponichi|language=ja|date=July 31, 2024|archive-date=July 31, 2024|archive-url=https://web.archive.org/web/20240731084745/https://www.sponichi.co.jp/entertainment/news/2024/07/31/kiji/20240731c000413K1043000c.html|url-status=live }}
• WaWOW! Festival (2024){{cite web|url=https://www.news1.kr/local/daejeon-chungnam/5566494|script-title=ko:충남도, 15일 광화문광장서 '와우 페스티벌'|trans-title=Chungnam Province, 'Wow Festival' at Gwanghwamun Square on the 15th|work=News1|date=October 13, 2024|language=ko|archive-date=November 6, 2024|archive-url=https://web.archive.org/web/20241106020727/https://www.news1.kr/local/daejeon-chungnam/5566494|url-status=live}}
• KNUT Festival - Young : one (2024){{Cite Instagram |user=knot_festival|postid=DBqRbw_zY6g|date=October 28, 2024 |title=Young: One special guest Onew |access-date=November 6, 2024}}
• Someday Christmas in Busan (2024){{Cite web|script-title=ko:크리스마스를 즐기는 가장 완벽한 뮤직 페스티벌 '2024 SOMEDAY CHRISTMAS' 여수·부산 개최|trans-title=The most perfect music festival to enjoy Christmas, '2024 SOMEDAY CHRISTMAS' held in Yeosu and Busan|url=https://sports.khan.co.kr/article/202411282010003|website=sports.khan.co.kr|language=ko|last=|date=November 28, 2024|archive-date=December 25, 2024|archive-url=https://web.archive.org/web/20241225161947/https://sports.khan.co.kr/article/202411282010003|url-status=live}}
• 2024 Supersound Festival in Macau (2025){{cite web|url=https://m.entertain.naver.com/article/609/0000943978|script-title=ko:샤이니 온유 'Winner' 제목 따라가네…'슈퍼사운드페스티벌' 대상 수상 |trans-title=SHINee Onew follows the title of 'Winner'... 'Super Sound Festival' Grand Prize Winner|work=Newsen|via=Naver|date=January 20, 2025|access-date=January 20, 2025|language=ko|archive-date=January 19, 2025|archive-url=https://web.archive.org/web/20250119233151/https://m.entertain.naver.com/article/609/0000943978|url-status=live}}
• Burn Art Festival (2025){{cite web|script-title=ko:온유·알레이나 카스티요·양홍원 등 '번아트페스티벌' 내일부터 이틀간 |trans-title="Burn Art Festival" by Onew, Aleena Castillo, Yang Hong-won, etc. for two days from tomorrow|url=https://www.slist.kr/news/articleView.html?idxno=615848|work=Slist|language=ko|date=January 31, 2025|archive-date=January 31, 2025|archive-url=https://web.archive.org/web/20250131194915/https://www.slist.kr/news/articleView.html?idxno=615848|url-status=live}}

{{col-end}}

{{See also|List of awards and nominations received by Shinee}}

{{reflist|30em}}

{{commons category}}

• {{YouTube|channel=UCXVCWwthUVgO4ledMbcKANQ|Onew}}
• [https://onew-fc.jp/ Onew Japan Official Website]
• [https://worldentertainment.jp/onew Onew] at World Entertainment Official Website
• {{HanCinema person}}
• {{IMDb name}}

{{Onew}}

{{Navboxes

|list=

{{Shinee}}

{{SM Entertainment}}

{{SM Town}}}}

{{Authority control}}

Category:1989 births

Category:Living people

Category:Shinee members

Category:Actors from Gwangmyeong

Category:Male actors from Gyeonggi Province

Category:Japanese-language singers of South Korea

Category:South Korean male pop singers

Category:South Korean dance musicians

Category:South Korean male idols

Category:South Korean male musical theatre actors

Category:South Korean male film actors

Category:South Korean male television actors

Category:South Korean male singer-songwriters

Category:21st-century South Korean singer-songwriters

Category:South Korean television presenters

Category:South Korean radio presenters

Category:SM Entertainment artists

Category:21st-century South Korean male singers

Category:21st-century South Korean male actors