Kim Se-jeong

Kim Se-jeong was born on August 28, 1996, in Gimje, North Jeolla Province, but moved to Anyang, Gyeonggi where she stayed with her mother and older brother at her aunt's house. Her parents split when she was a child, leaving her mother to single-handedly raise her and her brother. She has previously stated that she did not contact her father until she was in her third year of middle school.{{Cite news|script-title=ko:'님과함께2' 김세정 "아버지 중3때 10년 만에 봤다" 가정사 공개|url=http://news.nate.com/view/20160518n04251?mid=n1008|publisher=Nate|language=ko|date=May 18, 2016|access-date=June 18, 2016|archive-date=February 3, 2021|archive-url=https://web.archive.org/web/20210203085113/https://news.nate.com/view/20160518n04251?mid=n1008|url-status=live}}{{Cite web|script-title=ko:김세정 "10년 만에 만난 아빠, 첫인사는 미안"(영상)|url=http://www.dispatch.co.kr/523112|work=Dispatch|language=ko|date=May 24, 2016|access-date=June 23, 2016|archive-date=July 2, 2016|archive-url=https://web.archive.org/web/20160702114051/http://www.dispatch.co.kr/523112|url-status=live}} Before her debut, Kim participated in track and field competitions in elementary and middle school and was part of the Theatre Club in her high school. Kim passed Jellyfish Entertainment's auditions through a competition of 3,000 to 1 ratio, thus becoming a trainee.{{Cite news|script-title=ko:김세정, 10대 나이 데뷔...엄마 애정 "김치찌개에 집 생각"|url=http://www.newsinside.kr/news/articleView.html?idxno=1105982|website=newsinside.kr|language=ko|date=March 30, 2021|access-date=September 23, 2021|archive-date=March 4, 2022|archive-url=https://web.archive.org/web/20220304075906/http://www.newsinside.kr/news/articleView.html?idxno=1105982|url-status=live}} Kim studied practical music at Hanyang Women's University.{{Cite news |last=Hong |first=Ji-hoon |date=2021-02-08 |script-title=ko:김세정 "학력 그렇게 나쁘지 않아" 대학 한양여대 진학 |trans-title=Kim Se-jeong 'Academic background not that bad' goes to Hanyang Women's University |url=http://enter.etoday.co.kr/news/view/197134 |language=ko |work=Biz Entertainment |access-date=2025-03-01}}

{{Main|Produce 101 (season 1)|I.O.I}}

In 2012, Kim participated in the second season of competition television show K-pop Star 2 at the age of 16.{{cite news|script-title=ko:프로듀스101 순위1위 김세정, 3년전 'K팝스타2' 시절 어땠나|url=http://stoo.asiae.co.kr/news/view.htm?idxno=2016021308402015140|work=Asiae|language=ko|date=February 13, 2016|access-date=June 23, 2016|archive-date=March 16, 2016|archive-url=https://web.archive.org/web/20160316125703/http://stoo.asiae.co.kr/news/view.htm?idxno=2016021308402015140|url-status=live}}{{cite news|script-title=ko:프로듀스101 순위1위 김세정, 3년전 'K팝스타2' 시절 어땠나|url=http://news.chosun.com/site/data/html_dir/2016/02/20/2016022001708.html|work=The Chosun Ilbo|language=ko|date=February 20, 2016|access-date=February 28, 2017|archive-date=March 24, 2017|archive-url=https://web.archive.org/web/20170324204300/http://news.chosun.com/site/data/html_dir/2016/02/20/2016022001708.html|url-status=live}} She did not make it through the second round of the ranking audition, but Yang Hyun-suk brought her back as a wildcard for the casting round where Kim performed a duet of Taeyang's "I Need A Girl" with fellow contestant Jo Yoo-min.{{Cite web|title='K팝스타2' 조윤민·김세정, YG 동반 캐스팅..'깜짝'|url=http://news.chosun.com/site/data/html_dir/2013/01/06/2013010600996.html|work=The Chosun Ilbo|language=ko|date=January 6, 2013|access-date=June 26, 2016|archive-date=April 11, 2015|archive-url=https://web.archive.org/web/20150411231438/http://news.chosun.com/site/data/html_dir/2013/01/06/2013010600996.html|url-status=live}} They both made it to the final casting round along with contestants Nicole Curry and Lee Soo-kyung where Kim was eliminated from the competition.{{Cite web|script-title=ko:'케이팝 스타2' YG표 걸그룹, 혹평 속 니콜 커리만 YG행|url=http://news.tf.co.kr/read/entertain/1131433.htm|work=The Fact|language=ko-KR|date=January 20, 2013|access-date=June 23, 2016|archive-date=July 2, 2016|archive-url=https://web.archive.org/web/20160702114057/http://news.tf.co.kr/read/entertain/1131433.htm|url-status=live}}

File:Sejeong performing as an IOI Member.png

In January 2016, Kim represented Jellyfish Entertainment together with fellow trainees Kim Na-young and Kang Mi-na on the reality survival show Produce 101 for the chance to debut in an Mnet Project girl group.{{Cite news|script-title=ko:젤리피쉬가 애들잘뽑음(프로듀스101)|url=http://pann.nate.com/talk/330211039|work=Nate|language=ko|date=February 13, 2016|access-date=December 1, 2016|archive-date=December 20, 2016|archive-url=https://web.archive.org/web/20161220200146/http://pann.nate.com/talk/330211039|url-status=live}} All three were assigned to "Group A" in the first episode of the program and Kim achieved the first-place ranking on several episodes.{{Cite news|script-title=ko:'프로듀스101' 김세정 1위 지켰다...2위 최유정·3위 강미나|url=http://news.chosun.com/site/data/html_dir/2016/03/12/2016031200071.html|website=The Chosun Ilbo|access-date=June 26, 2016|archive-date=July 2, 2016|archive-url=https://web.archive.org/web/20160702114104/http://news.chosun.com/site/data/html_dir/2016/03/12/2016031200071.html|url-status=live}}{{Cite web|script-title=ko:프로듀스 101 김세정 1위, 눈물 소감...최고 시청률 경신|url=http://news.donga.com/BestClick/3/all/20160220/76553546/1|website=The Dong-A Ilbo|date=February 20, 2016|access-date=June 23, 2016|archive-date=February 21, 2016|archive-url=https://web.archive.org/web/20160221084948/http://news.donga.com/BestClick/3/all/20160220/76553546/1|url-status=live}} Kim was the runner-up contestant of the season, garnering 525,352 votes, officially becoming a member of the girl group I.O.I. They debuted on May 4, 2016, with the lead single "Dream Girls" from the album Chrysalis.{{Cite news|title=101 girls down to 'I.O.I'|url=https://www.koreatimes.co.kr/www/news/culture/2016/04/201_201874.html|work=The Korea Times|date=April 4, 2016|access-date=November 30, 2017|archive-date=August 4, 2017|archive-url=https://web.archive.org/web/20170804012747/http://www.koreatimes.co.kr/www/news/culture/2016/04/201_201874.html|url-status=live}} I.O.I disbanded in January 2017 and the members returned to their respective agencies at the end of their contracts.{{Cite web|script-title=ko:[단독] "I.O.I 완전체 8월에도 쭉"...이벤트+CF로 뭉친다|url=http://news.nate.com/view/20160731n0602mid=n1008|website=Nate|agency=Nate News|language=ko-KR|access-date=August 9, 2016|archive-date=February 3, 2021|archive-url=https://web.archive.org/web/20210203085056/https://news.nate.com/view/20160731n06025?mid=n1008|url-status=live}}

{{Main|Gugudan|Gugudan SeMiNa}}

On June 10, 2016, YMC Entertainment revealed that Kim would return to her agency to join and promote its upcoming girl group.{{Cite news|title=I.O.I, 유닛 멤버 확정...'전소미-주결경-최유정 등 7인'(공식입장)|url=http://entertain.naver.com/read?oid=057&aid=0000973823|work=Star MBN|language=ko|date=June 10, 2016|access-date=December 1, 2016|archive-date=August 7, 2017|archive-url=https://web.archive.org/web/20170807024803/http://entertain.naver.com/read?oid=057&aid=0000973823|url-status=live}} On June 28, 2016, while still members of I.O.I, Kim and Kang Mi-na joined Gugudan with the lead single "Wonderland".{{cite web|title=Kim Se-jeong, Kang Mi-na join Jellyfish's first girl group|url=http://kpopherald.koreaherald.com/view.php?ud=201606071441159116280_2&ACE_SEARCH=1|work=Kpop Herald|date=June 6, 2016|access-date=November 30, 2017|archive-date=October 9, 2018|archive-url=https://web.archive.org/web/20181009092646/http://kpopherald.koreaherald.com/view.php?ud=201606071441159116280_2&ACE_SEARCH=1|url-status=live}} On November 23, 2016, Kim participated in Jellyfish Entertainment's music channel project Jelly Box and released the single "Flower Way", produced by Zico, along with a music video.{{cite web|title=I.O.I's Kim Se-jeong to finish track with Zico|url=http://kpopherald.koreaherald.com/view.php?ud=201611161645299549870_2&ACE_SEARCH=1|work=Kpop Herald|date=November 16, 2016|access-date=November 30, 2017|archive-date=December 1, 2017|archive-url=https://web.archive.org/web/20171201043351/http://kpopherald.koreaherald.com/view.php?ud=201611161645299549870_2&ACE_SEARCH=1|url-status=live}} The single peaked at number two on the Gaon Digital Chart{{cite web|title='Flower Road' by I.O.I's Kim Se-jeong tops local chart|url=http://kpopherald.koreaherald.com/view.php?ud=201611231432245865629_2&ACE_SEARCH=1|work=Kpop Herald|date=November 23, 2016|access-date=November 30, 2017|archive-date=December 1, 2017|archive-url=https://web.archive.org/web/20171201040211/http://kpopherald.koreaherald.com/view.php?ud=201611231432245865629_2&ACE_SEARCH=1|url-status=live}} and Kim received her first solo artist music program trophy for the single on the November 30 episode of Show Champion.{{cite web|title=Gugudan′s Kim Se Jeong Wins First Music Program as Solo Artist|url=http://mwave.interest.me/en/kpop-news/article/110537/gugudans-kim-se-jeong-wins-first-music-program-as-solo-artist-all-kpop-news|work=enewsWorld|access-date=December 1, 2016|archive-date=August 7, 2017|archive-url=https://web.archive.org/web/20170807021046/http://mwave.interest.me/en/kpop-news/article/110537/gugudans-kim-se-jeong-wins-first-music-program-as-solo-artist-all-kpop-news|url-status=dead}} On January 12, 2017, Kim released the song "If Only" for the soundtrack of The Legend of the Blue Sea.{{cite news|script-title=ko:구구단 김세정 측 "'푸른바다' OST '만에하나' 참여 확정"(공식)|url=http://www.newsen.com/news_view.php?uid=201701050956410410|work=Newsen|language=ko|date=January 5, 2017|access-date=February 28, 2017|archive-date=March 1, 2017|archive-url=https://web.archive.org/web/20170301180333/http://www.newsen.com/news_view.php?uid=201701050956410410|url-status=live}} Later that year, she collaborated with Lee Tae-il of Block B for the digital single "I Like You, I Don't", which charted at number 8 on the Gaon Music Charts. Kim also collaborated with NCT's Doyoung on a song titled "Star Blossom" for the SM Station Season 2 music project.{{cite magazine|title=NCT's Doyoung and gugudan's Kim Sejeong Duet on Romantic 'Star Blossom'|url=http://www.billboard.com/articles/columns/k-town/7998558/nct-doyoung-gugudan-kim-sejeong-star-blossom-duet|magazine=Billboard|date=October 13, 2017|access-date=October 17, 2017|archive-date=October 17, 2017|archive-url=https://web.archive.org/web/20171017054543/http://www.billboard.com/articles/columns/k-town/7998558/nct-doyoung-gugudan-kim-sejeong-star-blossom-duet|url-status=live}}

Kim hosted the new KBS show Talents for Sale alongside Kim Jong-kook, Lee Seo-jin and Noh Hong-chul in 2016.{{Cite news|script-title=ko:김세정, '어서옵쇼' 고정 출연...지상파 예능 신고식텐아시아|url=http://tenasia.hankyung.com/archives/923475|work=TenAsia|language=ko|date=April 21, 2016|access-date=June 23, 2016|archive-date=April 21, 2016|archive-url=https://web.archive.org/web/20160421083205/http://tenasia.hankyung.com/archives/923475|url-status=live}} She would later get a "Rookie Variety" nomination in the 15th KBS Entertainment Awards.{{Cite news|script-title=ko:'어서옵쇼' 김세정, 열일하는 '재능 치트키!'...랩부터 팔씨름까지 못하는 게 없는 요정!|url=http://www.asiatoday.co.kr/view.php?key=20160618000946048|work=Asia Today|language=ko|access-date=August 9, 2016|archive-date=August 13, 2016|archive-url=https://web.archive.org/web/20160813052439/http://www.asiatoday.co.kr/view.php?key=20160618000946048|url-status=live}} In March 2017, she joined the reality-documentary Law of the Jungle in Sumatra. She was awarded with a "Best Challenge" Award on the 11th SBS Entertainment Awards.{{Cite news |author=Kwon Soo-bin |date=December 31, 2017 |title=[SBS연예대상]예능인 아닌 '미우새' 네 어머니 대상 진풍경(종합) |url=http://www.hankookilbo.com/v/41b9b0759ea7399541b9b0759ea73995 |accessdate=December 31, 2017 |work=Hankook Ilbo |language=ko}}{{citation needed|date=July 2023}}

In July 2017, she took on her first major acting role as the lead character Ra Eun-ho in KBS2's teen drama School 2017 where she won the "Best New Actress" award at the 31st KBS Drama Awards. She also was a vocalist for the series' soundtrack titled "Believe in this Moment".{{cite web|title=Kim Se-jung confirms role in 'School 2017'|url=http://kpopherald.koreaherald.com/view.php?ud=201706061706499215889_2|work=Kpop Herald|date=June 6, 2017|access-date=November 30, 2017|archive-date=July 20, 2018|archive-url=https://web.archive.org/web/20180720135717/http://kpopherald.koreaherald.com/view.php?ud=201706061706499215889_2|url-status=live}} In September 2017, she was announced to star in Netflix's first Korean variety show Busted!{{Cite web|script-title=ko:[공식입장] '범인은 바로 너' PD "유연석, 게스트로 함께 촬영 중'|url=http://mosen.mt.co.kr/article/G1110740542|website=mosen.mt.co.kr|language=ko|last=OSEN|date=September 27, 2017|access-date=July 7, 2023|archive-date=May 24, 2023|archive-url=https://web.archive.org/web/20230524142636/http://mosen.mt.co.kr/article/G1110740542|url-status=live}} That month, she also starred on OnStyle's show Get It Beauty.{{cite news|script-title=ko:구구단 세정, '겟잇뷰티' 고정 MC로 발탁|url=http://m.entertain.naver.com/read?oid=312&aid=0000234157|website=10Asia|language=ko|date=January 20, 2017|access-date=January 21, 2017|archive-date=August 7, 2017|archive-url=https://web.archive.org/web/20170807023011/http://m.entertain.naver.com/read?oid=312&aid=0000234157|url-status=live}} In January 2018, Kim became the first special co-host of Baek Jong-won's Alley Restaurant.{{Cite web|script-title=ko:[스브스夜] 골목식당 김세정, 백종원 주니어의 활약 (feat 고재근 남창희)|url=https://news.sbs.co.kr/news/endPage.do?news_id=N1004561311|website=Seoul Broadcasting System|language=ko|date=January 6, 2018|access-date=July 7, 2023|archive-date=August 30, 2018|archive-url=https://web.archive.org/web/20180830142303/https://news.sbs.co.kr/news/endPage.do?news_id=N1004561311|url-status=live}}

Kim and LEO were chosen to sing the official cheer song entitled "We, the Reds" for the South Korea national football team for the 2018 World Cup Tournament.{{cite news|title=Leo of VIXX and Sejeong Kim of Gugudan sang the cheering song for the 2018 World Cup in Russia|url=https://news.v.daum.net/v/20180522154620848?s=print_news|website=news.v.daum.net|language=ko|date=May 22, 2018|access-date=September 20, 2021|archive-date=December 23, 2021|archive-url=https://web.archive.org/web/20211223092950/https://news.v.daum.net/v/20180522154620848?s=print_news|url-status=live}} In June 2018, she was cast for tvN's sci-fi variety program Galileo: Awakened Universe, which was filmed using the Mars Desert Research Station (MDRS), the largest and longest-running Mars surface simulation facility in the world.{{cite web|title=[SBS Star] gugudan SEJEONG to Explore Mars with Kim Byung-man!|url=https://news.sbs.co.kr/news/endPage.do?news_id=N1004752369&plink=SEARCH&cooper=SBSNEWSSEARCH|website=news.sbs.co.kr|language=ko|date=May 10, 2018|access-date=September 20, 2021|archive-date=May 17, 2018|archive-url=https://web.archive.org/web/20180517153814/https://news.sbs.co.kr/news/endPage.do?news_id=N1004752369&plink=SEARCH&cooper=SBSNEWSSEARCH|url-status=live}} They were the first Korean entertainment crew to set foot on the Research Station.{{Citation needed|date=July 2023}}

File:Gugudan Sejeong.png

In June 2018, she formed Gugudan SeMiNa with fellow Produce 101 alumni members Mina and Nayoung. They debuted on July 10, 2018, with the single "SeMiNa".{{cite web|title=Gugudan's 'Semina' holds dual meaning|url=http://kpopherald.koreaherald.com/view.php?ud=201807041317541594623_2|website=Kpop Herald|date=July 4, 2018|access-date=September 13, 2018|archive-date=September 13, 2018|archive-url=https://web.archive.org/web/20180913184853/http://kpopherald.koreaherald.com/view.php?ud=201807041317541594623_2|url-status=live}} In September 2018, Kim released the song "Paramour" for the Mr. Sunshine soundtrack.{{cite web|title=Sejeong to release track for 'Mr. Sunshine'|url=http://kpopherald.koreaherald.com/view.php?ud=201809131543202564701_2|website=Kpop Herald|date=September 13, 2018|access-date=September 13, 2018|archive-date=September 13, 2018|archive-url=https://web.archive.org/web/20180913150441/http://kpopherald.koreaherald.com/view.php?ud=201809131543202564701_2|url-status=live}}

In 2019, Kim took her second leading role in the mystery romantic-comedy drama I Wanna Hear Your Song where she played a timpanist who lost her memories due to traumatic events.{{cite web|script-title=ko:연우진X김세정X송재림X박지연, KBS2 '너의 노래를 들려줘' 캐스팅 [공식]|url=https://n.news.naver.com/entertain/now/article/469/0000379964|website=Naver|language=ko|date=April 12, 2019|access-date=October 13, 2020|archive-date=July 15, 2020|archive-url=https://web.archive.org/web/20200715121849/https://n.news.naver.com/entertain/now/article/469/0000379964|url-status=live}}{{cite web|script-title=ko:김세정 측 "KBS '너의 노래를 들려줘' 긍정 검토중"(공식입장)|url=https://newsen.com/news_view.php?uid=201903291025071910|work=Newsen|language=ko|last=Park|first=Ah-reum|date=March 29, 2019|access-date=April 21, 2019|archive-date=October 13, 2020|archive-url=https://web.archive.org/web/20201013183048/https://newsen.com/news_view.php?uid=201903291025071910|url-status=live}} She would later win the K-Drama Hallyu Star Award on the 2019 KBS Drama Awards for the role. After a year of hiatus as a singer and three years since her solo debut song, Kim released the single "Tunnel" in collaboration with Dingo Music on December 2, 2019, followed by her first self-written and composed extended play titled Plant ({{Korean|hangul=화분|rr=Hwabun|labels=no}}), with its lead single of the same name, released on March 17, 2020. She wrote and composed all the tracks from her EP, except for the lead single.{{cite web|title=Kim Se-jeong is ready to make a solo statement: Gugudan member brings her personality to TV and new EP|url=http://koreajoongangdaily.joins.com/news/article/article.aspx?aid=3075077|work=Korea JoongAng Daily|date=March 18, 2020|access-date=March 29, 2020|archive-date=March 28, 2020|archive-url=https://web.archive.org/web/20200328171558/http://koreajoongangdaily.joins.com/news/article/Article.aspx?aid=3075077|url-status=live}} She received her second music award show trophy on The Show for the single. Kim released the song "All of My Days" for the drama Crash Landing on You, which charted at number 50 on the Gaon Digital Chart, followed by "What My Heart Says" for Record of Youth.{{cite web|script-title=ko:세정, '청춘기록' OST 오늘(13일) 발매..엔딩씬에 첫 등장 [공식]|url=https://n.news.naver.com/entertain/article/404/0000273071|website=Naver|language=ko|date=October 13, 2020|access-date=October 13, 2020|archive-date=October 13, 2020|archive-url=https://web.archive.org/web/20201013174550/https://n.news.naver.com/entertain/article/404/0000273071|url-status=live}} She later released the digital single "Whale" on August 17, 2020.{{cite web|script-title=ko:'구구단' 세정, 청량감 가득한 힐링송 'Whale' 발매|url=https://n.news.naver.com/entertain/article/005/0001352559|website=Naver|language=ko|date=August 17, 2020|access-date=March 11, 2021|archive-date=March 28, 2021|archive-url=https://web.archive.org/web/20210328111102/https://n.news.naver.com/entertain/article/005/0001352559|url-status=live}}{{cite web|script-title=ko:세정, 싱글 'Whale' 자켓 촬영 비하인드 컷 공개|url=https://n.news.naver.com/entertain/article/382/0000848128|website=Naver|language=ko|date=August 19, 2020|access-date=March 11, 2021|archive-date=March 28, 2021|archive-url=https://web.archive.org/web/20210328111044/https://n.news.naver.com/entertain/article/382/0000848128|url-status=live}}

File:Sejeong on SBS Radio on March 19, 2020 (4).jpg

Kim made her musical debut as the female lead in Return: The Promise of the Day, an original army musical that 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|script-title=ko:'군복무' 엑소 디오X시우민, 육군 창작뮤지컬 '귀환' 출연 확식)|url=https://n.news.naver.com/entertain/now/article/609/0000276878|website=Naver News|language=ko|access-date=May 13, 2020|archive-date=June 5, 2020|archive-url=https://web.archive.org/web/20200605114051/https://n.news.naver.com/entertain/now/article/609/0000276878|url-status=live}} On July 15, 2020, she was confirmed to star in The Uncanny Counter, where she played the role of Do Ha-na. The drama became the highest-rated OCN series of all time.{{Cite web|title=Nielsen Korea|url=http://www.nielsenkorea.co.kr/tv_terrestrial_day.asp?menu=Tit_1&sub_menu=3_1&area=00&begin_date=20201220|website=www.nielsenkorea.co.kr|access-date=July 7, 2023|archive-date=June 28, 2023|archive-url=https://web.archive.org/web/20230628204115/https://www.nielsenkorea.co.kr/tv_terrestrial_day.asp?menu=Tit_1&sub_menu=3_1&area=00&begin_date=20201220|url-status=live}} Kim also contributed to the drama's OST through her self-written and composed song "Meet Again" which charted at 147 on the Gaon Digital chart.{{cite web|script-title=ko:경이로운 소문 OST Part 2|trans-title=The Uncanny Counter OST Part2|url=https://www.melon.com/album/detail.htmalbumId=10536685|website=Melon|language=ko|date=February 12, 2021|access-date=February 12, 2021|archive-date=February 12, 2021|archive-url=https://www.melon.com/album/detail.htm?albumId=10536685|url-status=live}} After two years of inactivity, on December 31, 2020, Jellyfish Entertainment disbanded Gugudan. On May 11, 2021, Kim renewed her contract with the company as a solo artist and actress.{{cite web|script-title=ko:김세정, 현 소속사 '젤리피쉬'와 재계약|url=https://entertain.naver.com/read?oid=003&aid=0010491729|website=Naver|language=ko|date=May 11, 2021|access-date=May 11, 2021|archive-date=May 11, 2021|archive-url=https://web.archive.org/web/20210511030309/https://entertain.naver.com/read?oid=003&aid=0010491729|url-status=live}}

On March 9, 2021, it was revealed that she was preparing for a comeback.{{cite web|script-title=ko:[단독] 팔방미인 김세정, 가수 컴백 준비 중|url=https://n.news.naver.com/entertain/article/117/0003470645|website=Naver|language=ko|date=March 9, 2021|access-date=March 18, 2021|archive-date=March 9, 2021|archive-url=https://web.archive.org/web/20210309054711/https://n.news.naver.com/entertain/article/117/0003470645|url-status=live}}{{cite web|script-title=ko:김세정 측 "가수 컴백 준비 중, 정확한 일정 미정"(공식)|url=https://n.news.naver.com/entertain/now/article/609/0000410624|website=Naver|language=ko|date=March 9, 2021|access-date=March 18, 2021|archive-date=March 9, 2021|archive-url=https://web.archive.org/web/20210309115816/https://n.news.naver.com/entertain/now/article/609/0000410624|url-status=live}} On March 29, 2021, Kim released her second self-written and composed EP titled I'm with its lead single "Warning." Later that year, she featured in MC Mong's Flower 9 album with the song "Can I Go Back."{{cite web|script-title=ko:김세정, 두 번째 미니 앨범명 'I'm' 확정...오피셜 포토 공개|url=https://n.news.naver.com/entertain/article/015/0004515860|website=Naver|language=ko|date=March 19, 2021|access-date=March 19, 2021|archive-date=March 18, 2021|archive-url=https://web.archive.org/web/20210318233244/https://n.news.naver.com/entertain/article/015/0004515860|url-status=live}} On April 5, 2021, it was announced Kim would make her second musical appearance through Red Book, a feminist musical drama set in the Victorian era, as the main protagonist Anna.{{cite web|script-title=ko:뮤지컬 '레드북'에 차지연·아이비·김세정 합류|url=https://n.news.naver.com/mnews/article/421/0005269287?sid=103|website=Naver|language=ko|date=April 5, 2021|access-date=April 6, 2021|archive-date=March 2, 2022|archive-url=https://web.archive.org/web/20220302150546/https://n.news.naver.com/mnews/article/421/0005269287?sid=103|url-status=live}} Kim performed from June 7 to August 24, 2021, for a total of 28 shows. Red Book Musical received a viewer rating of 9.9 out of 10, the highest among the top 20 2021 Musicals.{{Cite web|script-title=ko:김세정, 뮤지컬 '레드북' 첫 공연 성료|url=http://sports.khan.co.kr/entertainment/sk_index.html?art_id=202106070830003&sec_id=540301&pt=nv|website=sports.khan.co.kr|language=ko|last=Kim|first=Seon-hee|date=June 7, 2021|access-date=June 16, 2021|archive-date=June 24, 2021|archive-url=https://web.archive.org/web/20210624195249/http://sports.khan.co.kr/entertainment/sk_index.html?art_id=202106070830003&sec_id=540301&pt=nv|url-status=live}}{{cite web|script-title=ko:"난 슬퍼질 때마다 야한 상상을 해요" 관객은 그녀의 용기에 박수를 보냈다|url=https://n.news.naver.com/article/023/0003632868|website=Naver|language=ko|date=August 11, 2021|access-date=September 7, 2021|archive-date=September 7, 2021|archive-url=https://web.archive.org/web/20210907081750/https://n.news.naver.com/article/023/0003632868|url-status=live}} The musical would later win the Best Picture Award, as well as Best New Musical Actress nomination for Kim at the 2022 Korean Musical Awards.{{cite web|script-title=ko:차지연·조풍래·김세정의 '레드북', 한국뮤지컬어워즈 7개 부분 노미네이트|url=https://www.asiatoday.co.kr/view.php?key=20211220010012136|website=AsiaToday|language=ko|date=December 20, 2021|access-date=December 20, 2021|archive-date=December 20, 2021|archive-url=https://web.archive.org/web/20211220091708/https://www.asiatoday.co.kr/view.php?key=20211220010012136|url-status=live}}{{cite web|title='Hadestown' takes top prize at Korea Musical Awards|url=https://news.koreaherald.com/view.php?ud=20220111000610&md=20220114003326_BL|website=TheKoreaHerald|language=en|date=January 11, 2022|access-date=January 11, 2022|archive-date=February 13, 2022|archive-url=https://web.archive.org/web/20220213063014/https://news.koreaherald.com/view.php?ud=20220111000610&md=20220114003326_BL|url-status=live}}

On May 4, 2021, Kim and the members of I.O.I celebrated their fifth debut anniversary with a reunion livestream show called "Yes, I Love It!".{{Cite web|title=I.O.I to celebrate 5th debut anniversary with a reunion show, here's everything you need to know|url=https://www.bandwagon.asia/articles/how-to-watch-ioi-celebrate-5th-debut-anniversary-with-a-reunion-show-here-everything-you-need-to-know-olleh-tv-seezn-tving-watch-kpop-2021|website=I.O.I to celebrate 5th debut anniversary with a reunion show, here's everything you need to know {{!}} Bandwagon {{!}} Music media championing and spotlighting music in Asia.|language=en|date=May 4, 2021|access-date=May 5, 2021|archive-date=May 5, 2021|archive-url=https://web.archive.org/web/20210505020854/https://www.bandwagon.asia/articles/how-to-watch-ioi-celebrate-5th-debut-anniversary-with-a-reunion-show-here-everything-you-need-to-know-olleh-tv-seezn-tving-watch-kpop-2021|url-status=live}} On July 23, 2021, Kim collaborated with Municon and released the digital single "Baby I Love U", a remake of the same song by Japanese singer TEE.{{cite web|script-title=ko:[공식] 김세정, 4개월만에 가수 컴백...23일 'Baby I Love U' 음원 발매|url=https://n.news.naver.com/entertain/now/article/312/0000489110|website=Naver|language=ko|date=July 13, 2021|access-date=July 13, 2021|archive-date=July 12, 2021|archive-url=https://web.archive.org/web/20210712232352/https://n.news.naver.com/entertain/now/article/312/0000489110|url-status=live}} At the end of 2021, Kim hosted the 2021 MBC Entertainment Awards with Jun Hyun-moo and Lee Sang-yi.

File:20220226 Kim Se-jeong 김세정 for Marie Claire Korea.jpg in February 2022]]

In February 2022, Kim starred as the female lead for the SBS romantic comedy Business Proposal alongside Ahn Hyo-seop.{{Cite news|script-title=ko:[공식] 김세정, '사내맞선' 캐스팅확정...긍정만렙女 캐릭터 "로코 초보라 많이 떨려|trans-title=[Official] Sejeong Kim, Casting Confirmation for 'Meet the Guy'... Positive female character "I'm very nervous because I'm a Rocco rookie|url=https://entertain.naver.com/now/read?oid=076&aid=0003761921|via=Naver|work=Sports Chosun|language=ko|author=Go Jae-wan|date=August 2, 2021|access-date=August 2, 2021|archive-date=August 2, 2021|archive-url=https://web.archive.org/web/20210802045930/https://entertain.naver.com/now/read?oid=076&aid=0003761921|url-status=live}} The drama attained the highest viewership ratings (11.6%) for a terrestrial Mon-Tue drama in 2022 and was the fourth overall most watched drama on National TV.{{cite web|script-title=ko:'불패' 깨진 KBS 주말극...'천변'·'사내맞선'으로 웃은 SBS [2022 드라마 결산①]|url=https://n.news.naver.com/entertain/article/108/0003116435|website=Naver|language=ko|date=December 26, 2022|access-date=January 7, 2023|archive-date=January 7, 2023|archive-url=https://web.archive.org/web/20230107053955/https://n.news.naver.com/entertain/article/108/0003116435|url-status=live}} It is the first Korean-made TV series that was simultaneously shown on a local TV channel and Netflix to rank No. 1 on the official viewership chart and ranked eighth overall in Netflix's Most Popular Non-English Shows for 2022.{{cite web|title='Business Proposal' stays atop Netflix non-English TV show chart for 3rd week|url=https://www.koreatimes.co.kr/www/art/2022/04/398_326838.html|website=The Korea Times|date=April 6, 2022|access-date=April 20, 2022|archive-date=April 6, 2022|archive-url=https://web.archive.org/web/20220406021744/https://www.koreatimes.co.kr/www/art/2022/04/398_326838.html|url-status=live}}{{cite web|title=Netflix Releases List of Most Popular Shows and Movies in 2022|url=https://whats-on-netflix.com/news/netflix-releases-list-of-most-popular-shows-and-movies-in-2022|website=WhatsOnNetflix|language=en|date=December 27, 2022|access-date=January 7, 2023|archive-date=January 6, 2023|archive-url=https://web.archive.org/web/20230106220433/https://www.whats-on-netflix.com/news/netflix-releases-list-of-most-popular-shows-and-movies-in-2022/|url-status=live}}{{Unreliable source?|reason=Per WP:UCG|date=March 2024}} Kim's performance drew praise from viewers and critics.{{cite web|script-title=ko:종영 '사내맞선' 김세정, 과몰입 유발 힐링 로맨스 선사..'로코 여신' 등극|url=https://www.breaknews.com/885001|website=BreakNews|language=ko|date=April 6, 2022|access-date=January 7, 2023|archive-date=April 6, 2022|archive-url=https://web.archive.org/web/20220406052235/https://www.breaknews.com/885001|url-status=live}} An acoustic version of "Love, Maybe" sung by Kim was released as a bonus track.{{Cite web|script-title=ko:사랑인가 봐 (사내맞선 OST Bonus Track)|trans-title=Love, Maybe (Business Proposal OST Bonus Track)|url=https://www.melon.com/album/detail.htm?albumId=10908601|via=Melon|publisher=Kakao Entertainment|agency=Flex M|language=ko|date=April 5, 2022|access-date=April 5, 2022|archive-date=April 5, 2022|archive-url=https://web.archive.org/web/20220405072450/https://www.melon.com/album/detail.htm?albumId=10908601|url-status=live}} The track peaked at number 108 and 92 on the Gaon Digital Chart and K-pop Hot 100 respectively.Peak chart positions on Gaon Digital Chart:

• {{Cite web|title=Sweet|url=http://gaonchart.co.kr/main/section/chart/online.gaon?nationGbn=T&serviceGbn=ALL&targetTime=11&hitYear=2022&termGbn=week|website=Gaon Music Chart|language=ko|date=March 6–12, 2022|access-date=April 21, 2022|archive-date=March 17, 2022|archive-url=https://web.archive.org/web/20220317020646/http://gaonchart.co.kr/main/section/chart/online.gaon?nationGbn=T&serviceGbn=ALL&targetTime=11&hitYear=2022&termGbn=week|url-status=live}}
• {{Cite web|title=Love, Maybe|url=http://gaonchart.co.kr/main/section/chart/online.gaon?nationGbn=T&serviceGbn=ALL&targetTime=18&hitYear=2022&termGbn=week|website=Gaon Music Chart|language=ko|access-date=May 5, 2022|archive-date=May 5, 2022|archive-url=https://web.archive.org/web/20220505025322/http://gaonchart.co.kr/main/section/chart/online.gaon?nationGbn=T&serviceGbn=ALL&targetTime=18&hitYear=2022&termGbn=week|url-status=live}}
• {{Cite web|title=Love, Maybe (Acoustic version)|url=http://gaonchart.co.kr/main/section/chart/online.gaon?nationGbn=T&serviceGbn=ALL&targetTime=15&hitYear=2022&termGbn=week|website=Gaon Music Chart|language=ko|date=April 3–9, 2022|access-date=April 21, 2022|archive-date=April 14, 2022|archive-url=https://web.archive.org/web/20220414024703/http://gaonchart.co.kr/main/section/chart/online.gaon?nationGbn=T&serviceGbn=ALL&targetTime=15&hitYear=2022&termGbn=week|url-status=live}}

Kim also starred in another SBS television series Today's Webtoon alongside Choi Daniel and Nam Yoon-su that year.{{cite web|title=Se-jeong to star in SBS's 'Today's Webtoon'|url=https://koreajoongangdaily.joins.com/2022/03/25/entertainment/television/Kim-Sejeong-Todays-Webtoon/20220325164908831.html|website=Korea JoongAng Daily|last=Shin|first=Min-hee|date=March 25, 2022|access-date=April 24, 2022|archive-date=April 24, 2022|archive-url=https://web.archive.org/web/20220424153629/https://koreajoongangdaily.joins.com/2022/03/25/entertainment/television/Kim-Sejeong-Todays-Webtoon/20220325164908831.html|url-status=live}} Kim's first solo fan meeting was scheduled to be held at Yes24 Live Hall on March 26, 2022,{{Cite news|script-title=ko:김세정, 첫 단독 팬미팅 '세정이의 세상일기' 3월 26일 개최 [공식]|trans-title='Sejeong's World Diary' held on March 26th [Official]|url=https://n.news.naver.com/entertain/now/article/108/0003030840|via=Naver|work=Star News|language=ko|author=Lee Deok-haeng|date=February 23, 2022|access-date=February 23, 2022|archive-date=February 23, 2022|archive-url=https://web.archive.org/web/20220223074551/https://n.news.naver.com/entertain/now/article/108/0003030840|url-status=live}} but was later postponed to April 23, 2022, after she tested positive for COVID-19.{{cite web|script-title=ko:김세정 코로나19 확진...팬미팅 일정 변동|trans-title=Kim Se-jeong confirmed with COVID-19... Fan meeting schedule change|url=https://n.news.naver.com/entertain/now/article/009/0004938448|via=Naver|work=Maeil Business Newspaper|language=ko|author=Shin Young-eun|date=March 22, 2022|access-date=March 22, 2022|archive-date=March 22, 2022|archive-url=https://web.archive.org/web/20220322141905/https://n.news.naver.com/entertain/now/article/009/0004938448|url-status=live}} Kim held her first overseas fan meetings in Indonesia, Thailand and Japan from November 4 to 11, 2022.{{cite web|script-title=ko:김세정, 인도네시아부터 태국까지...아시아 첫 팬미팅 투어 개최|trans-title=Kim Se-jeong, from Indonesia to Thailand... Asia's first fan meeting tour held|url=https://entertain.naver.com/now/read?oid=119&aid=0002642423|via=Naver|publisher=Dailyan|language=ko|last=Park|first=Jeong-seon|date=September 26, 2022|access-date=September 26, 2022|archive-date=September 26, 2022|archive-url=https://web.archive.org/web/20220926114922/https://entertain.naver.com/now/read?oid=119&aid=0002642423|url-status=live}}{{cite web|title=Kim Se-jeong to begin '2022 Sejong's Sesang Diary' meet-and-greet in November|url=https://entertain.naver.com/read?oid=640&aid=0000029516|via=Naver|publisher=Korea JoongAng Daily|language=ko|last=Shin|first=Min-hee|date=September 30, 2022|access-date=October 2, 2022|archive-date=October 2, 2022|archive-url=https://web.archive.org/web/20221002132215/https://entertain.naver.com/read?oid=640&aid=0000029516|url-status=live}} At the end of the year, Kim won the Popularity Award and the Best Actor Award at the 2023 Asia Artist Awards.{{cite web|script-title=ko:12월 4주 기준 2022년 드라마 출연자 최다 언급량 1위는 박은빈, 송중기·김태리·강태오·남주혁 TOP5...김세정·박민영·이종석·임윤아·이성민 뒤이어 [2022 드라마 결산①]|url=https://www.topstarnews.net/news/articleView.html?idxno=14883414|website=topstarnews|language=ko|date=December 28, 2022|access-date=January 7, 2023|archive-date=January 7, 2023|archive-url=https://web.archive.org/web/20230107053944/https://www.topstarnews.net/news/articleView.html?idxno=14883414|url-status=live}}{{cite web|script-title=ko:김세정 'AAA 2관왕!'[★포토]|url=https://n.news.naver.com/entertain/article/108/0003113021|website=Naver|language=ko|date=December 13, 2022|access-date=January 7, 2023|archive-date=January 7, 2023|archive-url=https://web.archive.org/web/20230107053954/https://n.news.naver.com/entertain/article/108/0003113021|url-status=live}} Kim hosted the 2022 SBS Drama Awards with Business Proposal costar Ahn Hyo-seop and comedian Shin Dong-yup. For her performance in Business Proposal, Kim won the Top Excellence Award, the Actress in a Miniseries Romance/Comedy Drama Award, and Best Couple Award with Ahn.{{Cite web|script-title=ko:'사내맞선' 안효섭 김세정, 나란히 최우수연기상 수상[SBS 연기대상]|trans-title='Business Proposal' Ahn Hyo-seop and Kim Se-jeong win the Top Excellence Award [SBS Drama Awards]|url=https://entertain.naver.com/read?oid=609&aid=0000672790|via=Naver|publisher=Newsen|language=ko|last=Park|first=Soo-in|date=December 31, 2022|access-date=December 31, 2022|archive-date=December 31, 2022|archive-url=https://web.archive.org/web/20221231145021/https://entertain.naver.com/read?oid=609&aid=0000672790|url-status=live}}

In July 2023, Kim appeared in the second season of The Uncanny Counter, reprising her role as Do Ha-na. In August 2023, it was announced that Kim would embark on her first solo concert tour across 10 countries, kicking off in Seoul on September 23 and 24.{{cite web|script-title=ko:김세정, 데뷔 첫 단독콘서트 연다...총 10개국 팬들과 호흡 예고|trans-title=Kim Se-jeong will hold her first solo concert since her debut...Announcement of meeting with fans from total of 10 countries|url=https://entertain.naver.com/read?oid=421&aid=0006964397|via=Naver|publisher=News1|language=ko|last=An|first=Tae-hyeon|date=August 1, 2023|access-date=August 20, 2023|archive-date=August 20, 2023|archive-url=https://web.archive.org/web/20230820063432/https://entertain.naver.com/read?oid=421&aid=0006964397|url-status=live}} That same month, Kim was announced as one of mentors of the reality competition series Universe Ticket (2023). Kim released her first studio album, Door ({{Korean|hangul=문|rr=Mun|labels=no}}), on September 4, 2023.{{cite web|script-title=ko:김세정, 9월 4일 첫 정규앨범 '문' 발표..가수 본업 컴백[공식]|trans-title=Kim Se-jeong releasing her first full-length album 'Door' on September 4th..a comeback as a singer[Official]|url=https://entertain.naver.com/read?oid=108&aid=0003173064|via=Naver|publisher=Star News|language=ko|last=Yoon|first=Sang-geun|date=August 8, 2023|access-date=August 20, 2023|archive-date=August 20, 2023|archive-url=https://web.archive.org/web/20230820063436/https://entertain.naver.com/read?oid=108&aid=0003173064|url-status=live}} In October 2023, it was announced that Kim would be debuting as a theater actress in the play Temple.

Kim was selected as an ambassador for the 2022 Hanoi Hallyu Expo.{{cite web|script-title=ko:김세정, '2022 하노이 한류박람회' 홍보대사 발탁|trans-title=Sejeong Kim selected as ambassador for '2022 Hanoi Hallyu Expo|url=https://entertain.naver.com/now/read?oid=018&aid=0005335478|via=Naver|work=E-Daily|language=ko|last=Yoon|first=Ki-baek|date=October 6, 2022|access-date=October 6, 2022|archive-date=February 4, 2023|archive-url=https://web.archive.org/web/20230204114719/https://entertain.naver.com/now/read?oid=018&aid=0005335478|url-status=live}} In October 2023, Kim and Choi Young-jae were chosen as public relations ambassadors for Korea-Thailand Mutual Visit Year.{{Cite web|script-title=ko:김세정·갓세븐 영재,한-태 상호방문의해 홍보대사로|url=http://biz.heraldcorp.com/view.php?ud=20230927000610|website=헤럴드경제|language=ko|last=함|first=영훈|date=September 27, 2023|access-date=December 22, 2023|archive-date=December 22, 2023|archive-url=https://web.archive.org/web/20231222122509/http://biz.heraldcorp.com/view.php?ud=20230927000610|url-status=live}} Kim also participated in the Korea Health Promotion and Development Institute's campaign "Online Smoking Cessation",{{Cite news|script-title=ko:금연송 '손절해 편'(김세정)|url=https://www.nosmokeguide.go.kr/lay2/bbs/S1T371C372/B/144/view.do?article_seq=787029&only_one=Y|website=nosmokeguide.go.kr|language=ko|date=February 3, 2020|access-date=September 26, 2021|archive-date=September 26, 2021|archive-url=https://web.archive.org/web/20210926071234/https://www.nosmokeguide.go.kr/lay2/bbs/S1T371C372/B/144/view.do?article_seq=787029&only_one=Y|url-status=live}} the Korea Creative Content Agency's campaign "Eradicate the use of Illegal Webtoon Distribution Sites"{{Cite news|script-title=ko:"웹툰을 지키는 독자적인 방법!" 캠페인과 함께해주세요!|url=https://m.post.naver.com/viewer/postView.naver?volumeNo=32265294&memberNo=28980604|website=Naver|language=ko|date=August 30, 2021|access-date=September 26, 2021|archive-date=September 26, 2021|archive-url=https://web.archive.org/web/20210926071232/https://m.post.naver.com/viewer/postView.naver?volumeNo=32265294&memberNo=28980604|url-status=live}}{{Unreliable source?|reason=See reliable sources list on WP:KO/RS|date=March 2025}} and the National Health Insurance Corporation's campaign "Smoking Cessation Treatment".{{citation needed|date=December 2023}}

Kim was considered 2021's Top CF Star for her work as an advertising model in various fields, such as food, architecture, home appliances, games, and public service advertisements.{{Cite news|script-title=ko:김세정, 명불허전 2021 CF 톱스타 우뚝|url=https://n.news.naver.com/entertain/article/215/0000984845|website=한국경제TV|language=ko|date=September 15, 2021|access-date=September 15, 2021|archive-date=September 15, 2021|archive-url=https://web.archive.org/web/20210915134512/https://n.news.naver.com/entertain/article/215/0000984845|url-status=live}} She also took first place in 2017's Female Advertising Model Brand Reputation survey for June and July.{{Cite news|title=[SC줌人] '학교' 마친 김세정, 광고 러브콜+해외 공연 꽃길 열렸다|url=https://www.chosun.com/site/data/html_dir/2017/09/08/2017090802023.html|website=The Chosun Ilbo|language=ko|date=September 8, 2017|access-date=September 15, 2021|archive-date=March 4, 2022|archive-url=https://web.archive.org/web/20220304001501/https://www.chosun.com/site/data/html_dir/2017/09/08/2017090802023.html|url-status=live}}

She was the global advertising model for Crocs' "Come As You Are" campaign alongside actors Natalie Dormer, Zooey Deschanel, Gina Jin, and Japanese model Suzu Hirose.{{Cite news|script-title=ko:[스타직찍] 구구단 김세정, 비타민 같은 상큼한 미소에 '시선집중'|url=http://www.dailypop.kr/news/articleView.html?idxno=38929|website=dailypop.kr|language=ko|date=April 30, 2019|access-date=September 20, 2021|archive-date=June 18, 2021|archive-url=https://web.archive.org/web/20210618093400/https://www.dailypop.kr/news/articleView.html?idxno=38929|url-status=live}} In 2018, she was selected as the brand model for Coca-Cola's spring/summer campaign with actor Park Bo-gum.{{Cite news|title=Park Bo-gum and Kim Sejeong's Refreshing Photoshoot With Coca-Cola|url=https://www.hancinema.net/lily-s-take-park-bo-gum-and-kim-sejeong-s-refreshing-photoshoot-with-coca-cola-116064.html|website=HanCinema|language=en|date=February 28, 2018|access-date=September 19, 2021|archive-date=March 3, 2022|archive-url=https://web.archive.org/web/20220303023240/https://www.hancinema.net/lily-s-take-park-bo-gum-and-kim-sejeong-s-refreshing-photoshoot-with-coca-cola-116064.html|url-status=live}} She modeled for Lotte High-Mart and was paired with Cha Eun-woo for Lotte's popular Waterpark commercial film .{{Cite news|script-title=ko:롯데워터파크 올 시즌 모델 차은우&김세정 발탁|url=http://www.gnnews.co.kr/news/articleView.html?idxno=301285|website=Gyeongnam Ilbo|language=ko|date=June 21, 2017|access-date=September 23, 2021|archive-date=March 2, 2022|archive-url=https://web.archive.org/web/20220302150549/http://www.gnnews.co.kr/news/articleView.html?idxno=301285|url-status=live}} In January 2019, she became the face of the alcoholic beverage, Good Day Soju, alongside celebrity chef Baek Jong-won.{{Cite news|script-title=ko:무학, 걸그룹 구구단 김세정 '좋은데이' 새 얼굴로선정!|url=http://www.ynamnews.co.kr/news/articleView.html?idxno=7199|website=ynamnews.co.kr|language=ko|date=January 22, 2019|access-date=September 23, 2021|archive-date=March 3, 2022|archive-url=https://web.archive.org/web/20220303053941/http://www.ynamnews.co.kr/news/articleView.html?idxno=7199|url-status=live}} Kim was also featured in an advertisement for Dong Won Tuna together with actor Jo Jung-suk. In 2020, she and her The Uncanny Counter cast mates, Yeom Hye-ran and Moon Suk, modeled for Dyson Coral hair straightener product. Kim and Yeom participated in a three-episode web variety show titled The Uncanny Touch for the product's promotion.{{citation needed|date=December 2023}}

In 2022, Kim was the endorser for cosmetic and clothing brands O!geti,{{Cite news|script-title=ko:비보존 헬스케어, 배우 김세정 전속 모델 발탁|url=http://www.bosa.co.kr/news/articleView.html?idxno=2168173|website=bosa.co.kr|language=ko|date=February 14, 2022|access-date=February 4, 2023|archive-date=February 4, 2023|archive-url=https://web.archive.org/web/20230204114716/http://www.bosa.co.kr/news/articleView.html?idxno=2168173|url-status=live}} Julie's Choice,{{Cite news|script-title=ko:줄리스초이스, 새 전속 모델 가수 겸 배우 김세정 발탁|url=https://n.news.naver.com/article/421/0006208943|website=Naver|language=ko|date=July 11, 2022|access-date=July 11, 2022|archive-date=July 11, 2022|archive-url=https://web.archive.org/web/20220711020713/https://n.news.naver.com/article/421/0006208943|url-status=live}} and Roem; food and beverage products such as Goobne Chicken{{Cite news|title=Kim Sejeong, selected as the new face of Goobne Chicken...Healthy Beautiful Eyes|url=http://www.slist.kr/news/articleView.html?idxno=336060|website=slist.kr|language=ko|date=March 4, 2022|access-date=March 4, 2022|archive-date=March 4, 2022|archive-url=https://web.archive.org/web/20220304012246/http://www.slist.kr/news/articleView.html?idxno=336060|url-status=live}} and Lotte's Starlight Cheongha Sparkling Alcohol;{{Cite news|script-title=ko:"화이트와인과 탄산 블렌딩" 롯데칠성, '별빛 청하 스파클링' 출시|url=https://n.news.naver.com/article/277/0005081058?lfrom=twitter|website=Naver|language=ko|date=April 28, 2022|access-date=April 28, 2022|archive-date=April 28, 2022|archive-url=https://web.archive.org/web/20220428002343/https://n.news.naver.com/article/277/0005081058?lfrom=twitter|url-status=live}} Living Workshop Household Goods{{Cite news|script-title=ko:김세정, 생활공작소 첫 브랜드 모델...4일부터 TV광고|url=https://n.news.naver.com/article/003/0011227539|website=Naver|language=ko|date=June 3, 2022|access-date=June 3, 2022|archive-date=June 3, 2022|archive-url=https://web.archive.org/web/20220603010554/https://n.news.naver.com/article/003/0011227539|url-status=live}} and popular video game Nexon's MapleStory where she was chosen to sing the theme song for Cygnus Knights.{{Cite news|script-title=ko:메이플스토리, '이그니션' 1차 업데이트 시그너스 기사단 리마스터|url=https://n.news.naver.com/sports/esports/article/442/0000151058|website=Naver|language=ko|date=June 30, 2022|access-date=June 30, 2022|archive-date=February 4, 2023|archive-url=https://web.archive.org/web/20230204114717/https://n.news.naver.com/sports/esports/article/442/0000151058|url-status=live}} In October 2022, Kim and Ahn Hyo-seop were chosen as brand ambassadors for Indonesian food and drink product Realfood. They collaborated with Indonesian actor Chicco Jerikho on a series of mini-commercial episodes to promote the brand.{{Cite news|title=Reuni{{as written}} Proposal! Ahn Hyo Seop dan Kim Sejeong Bertemu Kembali saat Menjadi Brand Ambassador Realfood|language=indonesian|date=October 9, 2022|access-date=October 9, 2022|website=jangkara.com|url=https://www.jangkara.com/entertainment/pr-6595127156/reuni-bussiness-proposal-ahn-hyo-seop-dan-kim-sejeong-bertemu-kembali-saat-menjadi-brand-ambassador-realfood|archive-date=February 18, 2023|archive-url=https://web.archive.org/web/20230218035736/https://www.jangkara.com/entertainment/pr-6595127156/reuni-bussiness-proposal-ahn-hyo-seop-dan-kim-sejeong-bertemu-kembali-saat-menjadi-brand-ambassador-realfood|url-status=live}} In 2023, Kim was the endorser for Namyang Dairy Products as the model for its flagship brand 'Delicious Milk GT'.{{Cite web|script-title=ko:남양유업, '맛있는 우유 GT' 광고 모델로 김세정 발탁|url=https://www.news1.kr/articles/5012551|website=News1|language=ko|date=April 12, 2023|access-date=December 22, 2023|archive-date=December 22, 2023|archive-url=https://web.archive.org/web/20231222125145/https://www.news1.kr/articles/5012551|url-status=live}} In February 2023, Kim was chosen as the first Asian global ambassador for the French luxury brand Longchamp.{{Cite news|script-title=ko:김세정, 롱샴 글로벌 앰버서더 선정...한국인 최초|url=https://www.newsis.com/view/?id=NISX20230206_0002182509&cID=10601&pID=10600|website=Newsis|language=ko|date=February 6, 2023|access-date=February 6, 2023|archive-date=February 18, 2023|archive-url=https://web.archive.org/web/20230218035736/https://www.newsis.com/view/?id=NISX20230206_0002182509&cID=10601&pID=10600|url-status=live}}

In January 2024, Kim was chosen as PlayStation's Asian model,{{Cite web|script-title=ko:[단독] 김세정, K팝 첫 '플레이스테이션' 아시아 얼굴 됐다|url=https://n.news.naver.com/article/629/0000264279|website=Naver News|language=ko|last=최|first=승진|access-date=February 26, 2024|archive-date=February 26, 2024|archive-url=https://web.archive.org/web/20240226144358/https://n.news.naver.com/article/629/0000264279|url-status=live}} as well as an advertising model for the clothing brand itMICHAA's second campaign "Do it all!".{{Cite web|script-title=ko:당당하게, 김세정답게[화보]|url=https://n.news.naver.com/entertain/article/144/0000943101|website=Naver News|language=ko|access-date=February 26, 2024|archive-date=February 26, 2024|archive-url=https://web.archive.org/web/20240226144358/https://n.news.naver.com/entertain/article/144/0000943101|url-status=live}}

Over the course of her career, Kim has also endorsed beauty products such as Manyo Factory Brand Cosmetics,{{Cite news|script-title=ko:마녀공장, 모델 김세정과 '2020 세정은 마녀공장' 캠페인 실시|url=http://www.geniepark.co.kr/news/articleView.html?idxno=45593|website=geniepark.co.kr|language=ko|date=May 21, 2020|access-date=September 23, 2021|archive-date=June 29, 2022|archive-url=https://web.archive.org/web/20220629214146/https://www.geniepark.co.kr/news/articleView.html?idxno=45593|url-status=live}} Acwell,{{Cite news|script-title=ko:김세정, 비앤에이치 코스메틱 '아크웰' 전속 광고모델 발탁|url=https://www.yna.co.kr/view/AKR20180205115100848|website=Yonhap News Agency|language=ko|date=February 5, 2018|access-date=September 23, 2021|archive-date=March 2, 2022|archive-url=https://web.archive.org/web/20220302212401/https://www.yna.co.kr/view/AKR20180205115100848|url-status=live}} and Myskin Solus;{{Cite news|script-title=ko:마이스킨솔루스X김세정 바이럴 필름, 100만 뷰 돌파|url=https://www.seoul.co.kr/news/newsView.php?id=20201207500109|website=Seoul Shinmun|language=ko|date=December 12, 2020|access-date=September 23, 2021|archive-date=March 2, 2022|archive-url=https://web.archive.org/web/20220302093351/https://www.seoul.co.kr/news/newsView.php?id=20201207500109|url-status=live}} food and beverage products such as Cocolab,{{Cite news|script-title=ko:서도비엔아이, '코코랩' 모델로 만능 엔터테이너 김세정 발탁|url=https://www.donga.com/news/Entertainment/article/all/20200611/101469893/2|website=The Dong-A Ilbo|language=ko|date=June 12, 2020|access-date=September 23, 2021|archive-date=March 4, 2022|archive-url=https://web.archive.org/web/20220304075904/https://www.donga.com/news/Entertainment/article/all/20200611/101469893/2|url-status=live}} Sunkist Fruit Cider,{{Cite news|script-title=ko:해태htb, '썬키스트 과일사이다' 모델로 가수 김세정 발탁|url=https://fetv.co.kr/news/article.html?no=60564|website=fetv.co.kr|language=ko|date=August 3, 2020|access-date=September 23, 2021|archive-date=March 3, 2022|archive-url=https://web.archive.org/web/20220303115240/https://fetv.co.kr/news/article.html?no=60564|url-status=live}} and Viyotte;{{Cite news|script-title=ko:서울우유, '비요뜨' 모델로 김세정 발탁|url=http://news.heraldcorp.com/view.php?ud=20210610000350|website=news.heraldcorp.com|language=ko|date=June 10, 2021|access-date=September 23, 2021|archive-date=March 3, 2022|archive-url=https://web.archive.org/web/20220303053636/http://news.heraldcorp.com/view.php?ud=20210610000350|url-status=live}} online and RPG games Sudden Attack,{{Cite news|script-title=ko:넥슨 '서든어택', 2020 시즌1 업데이트...구구단 세정 신규 캐릭터 등장|url=https://www.thedailypost.kr/news/articleView.html?idxno=72363|website=thedailypost.kr|language=ko|date=January 2, 2021|access-date=September 23, 2021|archive-date=February 4, 2023|archive-url=https://web.archive.org/web/20230204114716/https://www.thedailypost.kr/news/articleView.html?idxno=72363|url-status=live}} Destiny Child: Defense War,{{Cite news|script-title=ko:김세정 또 떴다! 이번엔 '데스티니 차일드: 디펜스워'|url=https://post.naver.com/viewer/postView.nhn?volumeNo=30427125&memberNo=6258463|website=Naver|language=ko|date=January 8, 2021|access-date=September 23, 2021|archive-date=March 4, 2022|archive-url=https://web.archive.org/web/20220304001502/https://post.naver.com/viewer/postView.nhn?volumeNo=30427125&memberNo=6258463|url-status=live}}{{Unreliable source?|reason=See reliable sources list on WP:KO/RS|date=March 2025}} and Armis.{{Cite news|script-title=ko:김세정과 함께하는 '아르미스', 사전예약 시작|url=https://n.news.naver.com/sports/esports/article/442/0000137146|website=Naver|language=ko|date=July 15, 2021|access-date=September 23, 2021|archive-date=February 4, 2023|archive-url=https://web.archive.org/web/20230204114715/https://n.news.naver.com/sports/esports/article/442/0000137146|url-status=live}} She appeared in other popular advertisements campaigns for various products such as Samsung's virtual assistant Bixby, Oella,{{Cite news|script-title=ko:앱코 '오엘라', 김세정 LED 필터 샤워기 공식 모델 발탁해|url=http://www.todaykorea.co.kr/news/articleView.html?idxno=286257|website=todaykorea.co.kr|language=ko|date=April 16, 2020|access-date=September 23, 2021|archive-date=April 16, 2021|archive-url=https://web.archive.org/web/20210416074005/http://www.todaykorea.co.kr/news/articleView.html?idxno=286257|url-status=live}} and GH Basic Housing.{{Cite news|title=GH,'일상이 아름다운 기본주택' 슬로건 공개|url=https://www.fnnews.com/news/202011301058474015|website=fnnews.com|language=ko|date=November 30, 2020|access-date=September 23, 2021|archive-date=March 3, 2022|archive-url=https://web.archive.org/web/20220303023240/https://www.fnnews.com/news/202011301058474015|url-status=live}}

On March 8, 2022, Kim donated {{KRW|10|link=yes}} million to the Hope Bridge Disaster Relief Association to help the victims of the massive wildfire that started in Uljin, Gyeongbuk and has spread to Samcheok, Gangwon.{{cite web|script-title=ko:김세정, 산불 피해 지원에 1천만원 기부...마음도 착해|trans-title=Kim Se-jeong donates 10 million won to support forest fire damage... I have a good heart|url=https://entertain.naver.com/now/read?oid=117&aid=0003582787|via=Naver|publisher=MyDaily|language=ko|author=Lee Seung-gil|date=March 8, 2022|access-date=March 8, 2022|archive-date=February 4, 2023|archive-url=https://web.archive.org/web/20230204114720/https://entertain.naver.com/now/read?oid=117&aid=0003582787|url-status=live}} On March 31, Kim donated {{KRW|10}} million to Fruit of Love, Community Chest of Korea to help war refugees in Ukraine.{{cite web|script-title=ko:김세정, 우크라이나 난민 구호 위해 1천만원 기부|trans-title=Kim Se-jeong donates 10 million won to help Ukrainian refugees|url=https://entertain.naver.com/now/read?oid=009&aid=0004942766|via=Naver|publisher=Maeil Business News|language=ko|author=Shin Young-eun|date=March 31, 2022|access-date=March 30, 2022|archive-date=March 31, 2022|archive-url=https://web.archive.org/web/20220331171757/https://entertain.naver.com/now/read?oid=009&aid=0004942766|url-status=live}} On August 19, Kim donated {{KRW|20 million}} to the Hope Bridge Korea Disaster Relief Association to help those affected by the 2022 South Korean floods.{{cite web|script-title=ko:김세정, 수해 피해 이재민 위해 2000만원 쾌척... "조금이나마 도움되길|trans-title=Kim Se-jeong, donate 20 million won to victims of flood damage... "Hopefully it will help you|url=https://entertain.naver.com/now/read?oid=052&aid=0001778670|via=Naver|publisher=YTN|language=ko|author=Kim Seong-hyeon|date=August 19, 2022|access-date=August 19, 2022|archive-date=August 19, 2022|archive-url=https://web.archive.org/web/20220819020407/https://entertain.naver.com/now/read?oid=052&aid=0001778670|url-status=live}} On September 7, Kim donated {{KRW|10 million}} to the Hope Bridge Korea Disaster Relief Association to support those who suffered damages due to Typhoon Hinnamnor.{{cite web|script-title=ko:조금이라도 도움 되길"...김세정, 태풍 피해 극복 성금 1000만원 기부|trans-title=Hopefully it will be of some help"... Kim Se-jeong, donated 10 million won to overcome typhoon damage|url=https://entertain.naver.com/now/read?oid=416&aid=0000287281|via=Naver|publisher=SBS Entertainment News|language=ko|author=Kang Kyung-yun|date=September 7, 2022|access-date=September 7, 2022|archive-date=September 7, 2022|archive-url=https://web.archive.org/web/20220907063542/https://entertain.naver.com/now/read?oid=416&aid=0000287281|url-status=live}}

On February 10, 2023, Kim donated {{KRW|40 million}} to the Hope Bridge National Disaster Relief Association to help victims of the 2023 Turkey–Syria earthquake.{{cite web|script-title=ko:1억 기부" MC몽·NCT 도영, 튀르키예·시리아 지진피해 도움 손길..3일째 기부행렬[Oh!쎈 이슈]|trans-title="Donation of 100 million" MC Mong, NCT Doyoung, helping the earthquake victims in Turkey and Syria... Day 3 of the donation procession [Oh!sen issue]|url=https://entertain.naver.com/read?oid=109&aid=0004786898|via=Naver|publisher=OSEN|language=ko|last=Kang|first=Seo-jeong|date=February 10, 2023|access-date=February 11, 2023|archive-date=February 11, 2023|archive-url=https://web.archive.org/web/20230211151257/https://entertain.naver.com/read?oid=109&aid=0004786898|url-status=live}}

On December 22, 2023, the Korean Autism Love Association announced that Kim has donated {{KRW|50 million}} for individuals with autism (autistic individuals) and their families. Through character research and acting practice for the play 'Temple', Kim developed an interest in and understanding of autism, expressing the narratives of characters with diverse histories convincingly. Her journey led her to donate to autism and families, delivering a message of hope and support.{{Cite web|script-title=ko:배우 김세정, 연극 '템플' 계기로 자폐성장애인‧가족 위해 5천만원 기부|url=https://www.ablenews.co.kr/news/articleView.html?idxno=209746|website=에이블뉴스|language=ko|date=December 22, 2023|access-date=December 22, 2023|archive-date=December 22, 2023|archive-url=https://web.archive.org/web/20231222121531/https://www.ablenews.co.kr/news/articleView.html?idxno=209746|url-status=live}}

Kim was the vocalist for both I.O.I and Gugudan and is known for her sweet, powerful, raspy voice as well as for her emotional healing songs. Kim cites IU, Girls' Generation's Taeyeon, and Ailee as her role models in singing and often uses their songs in her practice sessions.{{Cite news|script-title=ko:[인터뷰②] '레드북' 김세정 "롤모델은 유준상·아이유, 계속 꿈꾸고 싶어"|url=https://www.mk.co.kr/star/hot-issues/view/2021/08/752105/|website=Maeil Business Newspaper|language=ko|date=April 4, 2021|access-date=September 26, 2021|archive-date=September 26, 2021|archive-url=https://web.archive.org/web/20210926071237/https://www.mk.co.kr/star/hot-issues/view/2021/08/752105/|url-status=live}}{{Cite news|script-title=ko:'놀라운 토요일' 김세정, 태연 관우 수염 분장에 "제 롤모델이신데..."|url=http://www.newsinside.kr/news/articleView.html?idxno=1102821|website=newsinside.kr|language=ko|date=February 14, 2021|access-date=September 26, 2021|archive-date=September 26, 2021|archive-url=https://web.archive.org/web/20210926071235/http://www.newsinside.kr/news/articleView.html?idxno=1102821|url-status=live}}{{Cite news|script-title=ko:'판듀2' 김세정, 에일리와 듀엣 후 눈물 "꿈꿔온 무대, 너무 긴장해"|url=https://www.chosun.com/site/data/html_dir/2017/11/19/2017111901750.html|website=The Chosun Ilbo|language=ko|date=November 19, 2017|access-date=September 26, 2021|archive-date=September 26, 2021|archive-url=https://web.archive.org/web/20210926071230/https://www.chosun.com/site/data/html_dir/2017/11/19/2017111901750.html|url-status=live}} Kim is often called the icon of "Flower Way" through broadcasts and media after her famous speech to her mother, "I will only let you walk on the flower road from now on," during the first elimination round of Produce 101 where she won first place.{{Cite news|title=[S톡] 김세정, '꽃길' 하면 '세정' 확실한 브랜드 됐다|url=http://www.stardailynews.co.kr/news/articleView.html?idxno=188281|website=stardailynews.co.kr|language=ko|date=March 16, 2018|access-date=September 23, 2021|archive-date=September 26, 2021|archive-url=https://web.archive.org/web/20210926071232/http://www.stardailynews.co.kr/news/articleView.html?idxno=188281|url-status=live}} Her first solo song "Flower Way" was based on the letter Kim wrote for her mother in Talents for Sale where she was a host.{{Cite news|script-title=ko:김세정x지코 '꽃길', 7개 차트 1위 올킬 '新음원퀸'|url=https://sports.chosun.com/news/ntype.htm?id=201611240100206260013884&servicedate=20161123|website=Sports Chosun|language=ko|date=November 23, 2016|access-date=September 23, 2021|archive-date=September 26, 2021|archive-url=https://web.archive.org/web/20210926071234/https://sports.chosun.com/news/ntype.htm?id=201611240100206260013884&servicedate=20161123|url-status=live}} In August 2021, she won the Multi-tainer Award at 2021 Brand of the Year Awards for her works on various entertainment field such as music, drama, variety and musicals.{{Cite news|title=2021 올해의 브랜드 대상|url=https://abk.kcforum.co.kr/2021/|website=kcforum.co.kr|language=ko|date=August 19, 2021|access-date=August 19, 2021|archive-date=July 14, 2021|archive-url=https://web.archive.org/web/20210714221431/https://abk.kcforum.co.kr/2021/|url-status=live}}{{Cite news|script-title=ko:경이로운 김세정, 2021 올해의 브랜드 대상 '올해의 멀티테이너|trans-title=Kim Se-jeong, 2021 Brand of the Year Grand Prize 'Multitainer of the Year'|url=https://entertain.naver.com/now/read?oid=108&aid=0002982063|work=Star News|publisher=Naver|language=ko|author=Moon Wan-shik|date=August 20, 2021|access-date=August 20, 2021|archive-date=February 4, 2023|archive-url=https://web.archive.org/web/20230204114720/https://entertain.naver.com/now/read?oid=108&aid=0002982063|url-status=live}}

Aside from singing and acting, Kim is a sports enthusiast and known for her athletic skills and strong physique and have been featured on various entertainment shows and headlines thus receiving the tag "Strong Female Idol."{{Cite news|script-title=ko:김세정, 모두가 놀란 충격 근황..."보디빌더급 근육미?"|url=https://m.news.nate.com/view/20200908n04621|website=Nate|language=ko|date=September 8, 2020|access-date=September 23, 2021|archive-date=February 4, 2023|archive-url=https://web.archive.org/web/20230204114723/https://m.news.nate.com/view/20200908n04621|url-status=live}} Kim together with her group Gugudan are three-time gold medalists in three consecutive years and record holders for the Women's Archery Competition in Idol Star Athletics Championships and a gold medalist and record holder with her I.O.I and Gugudan member Mina in Women's Bowling Competition.{{Cite news|script-title=ko:'아육대' 구구단 세정X미나, 女 볼링 단체 신기록 달성...발군의 실력 입증|url=http://www.sportsseoul.com/news/read/726513|website=Sports Seoul|language=ko|date=February 6, 2019|access-date=September 23, 2021|archive-date=February 4, 2023|archive-url=https://web.archive.org/web/20230204114722/http://www.sportsseoul.com/news/read/726513|url-status=live}}{{Cite news|script-title=ko:[어게인TV]"新기록의 연속" 엑소 찬열→아스트로·구구단까지 '체육돌'들의 탄생|url=http://pop.heraldcorp.com/view.php?ud=201902062007176151468_1|website=pop.heraldcorp.com|language=ko|date=February 7, 2019|access-date=September 23, 2021|archive-date=February 4, 2023|archive-url=https://web.archive.org/web/20230204120250/http://www.heraldpop.com/view.php?ud=201902062007176151468_1|url-status=live}}

{{For|Kim's discography with I.O.I, Gugudan and Gugudan SeMiNa|I.O.I discography|Gugudan discography|Gugudan SeMiNa#Discography}}

All song credits are adapted from the Korea Music Copyright Association's database under Kim Sejeong unless otherwise noted.{{Cite web|title=Songs Registered Under KIM SE-JEONG (10019916)|url=https://www.komca.or.kr/srch2/srch_01_popup_mem_right.jsp?S_MB_CD=10019916|website=Korea Music Copyright Association|language=ko|access-date=September 4, 2023|archive-date=March 19, 2022|archive-url=https://web.archive.org/web/20220319050952/https://www.komca.or.kr/srch2/srch_01_popup_mem_right.jsp?S_MB_CD=10019916|url-status=live}}

{{For|Kim's videography with I.O.I, Gugudan and Gugudan SeMiNa|I.O.I#Videography|Gugudan#Videography|Gugudan SeMiNa#Videography}}

{{For|Kim's filmography with I.O.I and Gugudan|I.O.I filmography|Gugudan filmography}}

{{For|Kim's accolades with I.O.I and Gugudan|List of awards and nominations received by I.O.I|Gugudan#Awards and nominations}}

{{BLP sources section|date=December 2022}}

{{Notelist-ua}}

{{Reflist}}

{{commons category|Kim Se-jeong}}

• {{Official website|1=http://www.jelly-fish.co.kr/sub/artist/view.html?idx=34}}
• {{Hancinema person|Kim_Sejeong}}
• {{MusicBrainz artist|id=c41fab9f-c9ac-4d6f-9ccc-53f28656e987|name=Kim Se-jeong}}

{{Kim Se-jeong}}

{{Gugudan}}

{{I.O.I}}

{{Produce 101}}

{{K-pop Star}}

{{Authority control}}

{{DEFAULTSORT:Kim, Se-jeong}}

Category:Kim Se-jeong

Category:1996 births

Category:Living people

Category:Actresses from Anyang, Gyeonggi

Category:Singers from Gyeonggi Province

Category:People from Gimje

Category:Actresses from North Jeolla Province

Category:Musicians from North Jeolla Province

Category:Jellyfish Entertainment artists

Category:South Korean female idols

Category:South Korean women pop singers

Category:Swing Entertainment artists

Category:South Korean television actresses

Category:South Korean musical theatre actresses

Category:K-pop Star participants

Category:Produce 101 contestants

Category:Gugudan

Category:I.O.I members

Category:Reality show winners

Category:21st-century South Korean women singers

Category:21st-century South Korean singers

Category:21st-century South Korean actresses

Category:Gwangsan Kim clan