I.O.I

{{Main|Produce 101 (season 1)}}

In November 2015, Mnet announced their new survival show that would bring together 101 trainees from 46 entertainment companies to form a unit girl group with eleven members chosen by the viewers. The show premiered on January 21, 2016, and ended on April 1, 2016.{{cite web|last1=Seon|first1=Mi-kyung|title='프로듀스101' 전소미, 1위 지켰다…이변없는 I.O.I 멤버 11인 확정[종합]|url=http://news.nate.com/view/20160402n00730|website=Nate|publisher=OSEN|access-date=April 2, 2016|language=ko|archive-date=December 25, 2020|archive-url=https://web.archive.org/web/20201225133439/https://news.nate.com/view/20160402n00730|url-status=live}}{{cite web|last1=Kim|first1=Do-hyeong|title='프로듀스 101' 최종 1위 전소미…11위 유연정 '데뷔 확정' (종합)|url=http://news.nate.com/view/20160402n00783|website=Nate|publisher=Sports Seoul|access-date=April 2, 2016|language=ko|archive-date=May 24, 2019|archive-url=https://web.archive.org/web/20190524110011/https://news.nate.com/view/20160402n00783|url-status=live}}

Prior to Produce 101, some of the members of I.O.I gained recognition after appearing on other television shows: Kim Se-jeong was a contestant on competition show K-pop Star 2 in 2012, Jeon So-mi was a member of the 2015 reality survival show Sixteen, and Choi Yoo-jung appeared in the web drama To Be Continued.{{cite web|title=K팝스타2 김세정,박소연,김민정 폭풍성장(프로듀스101)|url=http://www.instiz.net/pt/3476113|website=Instiz|access-date=April 2, 2016|language=ko|date=2018-10-20|archive-date=March 4, 2016|archive-url=https://web.archive.org/web/20160304235820/http://www.instiz.net/pt/3476113|url-status=live}}{{cite web|last1=Kim|first1=Hyeon-min|title='프로듀스 101', 14명의 소녀들 소개 영상…'트와이스' 소미 지원사격|url=http://pop.heraldcorp.com/view.php?ud=201512181824022541250_8|website=Herald Pop|access-date=April 2, 2016|language=ko|date=2015-12-18|archive-date=March 5, 2016|archive-url=https://web.archive.org/web/20160305112305/http://pop.heraldcorp.com/view.php?ud=201512181824022541250_8|url-status=live}}{{cite web|last1=Kim|first1=Ji-hye|title='프로듀스101′ 전소미, 두 번째 오디션 도전…트와이스 지원사격 '의리'|url=http://tenasia.hankyung.com/archives/806220|website=Tenasia|access-date=April 2, 2016|language=ko|date=2015-12-18|archive-date=March 4, 2016|archive-url=https://web.archive.org/web/20160304050838/http://tenasia.hankyung.com/archives/806220|url-status=live}} In September 2015, Jung Chae-yeon debuted as a member of DIA but temporarily withdrew from the group to join Produce 101. She also had a cameo appearance in the 2015 web drama Sweet Temptation.{{cite web|last1=Jeong|first1=Yoo-jin|title=다이아 측 "채연•캐시 잠정 탈퇴..'프로듀스' 합류" [공식입장]|url=http://entertain.naver.com/read?oid=109&aid=0003224000|website=Naver|publisher=OSEN|access-date=April 2, 2016|language=ko|archive-date=March 4, 2016|archive-url=https://web.archive.org/web/20160304120930/http://entertain.naver.com/read?oid=109&aid=0003224000|url-status=live}}{{cite web|last1=Jeong|first1=Yoo-jin|title=다이아 채연•캐시, '프로듀스 101' 합류 하면서 잠정탈퇴…"새로운 도전"|url=http://mbn.mk.co.kr/pages/news/newsView.php?news_seq_no=2709392|website=MBN News|access-date=April 2, 2016|language=ko|date=2015-12-22|archive-date=February 3, 2021|archive-url=https://web.archive.org/web/20210203180515/https://www.mbn.co.kr/news/entertain/2709392|url-status=live}}

It was initially planned for the group to debut on April 1, 2016, with the song "Crush," which they performed as part of the finale of the show, but YMC Entertainment and Mnet decided to postpone the debut to better prepare the group's concept and choreography with a new song as I.O.I's debut single.{{Cite news|url=http://entertain.naver.com/ranking/read?oid=109&aid=0003288182|title=[단독] '프로듀스101', 5월 정식 데뷔…'크러쉬' 아닌 신곡|access-date=2016-10-31|archive-date=July 5, 2017|archive-url=https://web.archive.org/web/20170705124156/http://entertain.naver.com/ranking/read?oid=109&aid=0003288182|url-status=live}} Its genre was referred to as "Trapical Dutch Funk" ({{Korean|hangul=트래피컬 더치 펑크|labels=no}}).{{cite web|last1=Kim|first1=Yoon-jin|title=아이오아이 '크러쉬' 신곡 열풍 "'프로듀스 101'인기 이어간다"|url=http://news.mk.co.kr/newsRead.php?no=250026&year=2016|website=MK News|date=April 5, 2016 |publisher=Daily News|access-date=April 6, 2016|language=ko|archive-date=October 23, 2017|archive-url=https://web.archive.org/web/20171023035552/http://news.mk.co.kr/newsRead.php?no=250026&year=2016|url-status=live}}

On April 3, 2016, a representative gave details of the plans for the debut of the group. Instead of releasing a digital single as initially planned, I.O.I would be releasing an EP with various songs.{{cite web|last1=Park|first1=Hyun-min|title=[단독] '프듀101' I.O.I, 5월 미니앨범 발매…데뷔 윤곽|url=http://entertain.naver.com/read?oid=109&aid=0003291362|website=Naver|publisher=OSEN|access-date=April 3, 2016|language=ko|archive-date=July 5, 2017|archive-url=https://web.archive.org/web/20170705111827/http://entertain.naver.com/read?oid=109&aid=0003291362|url-status=live}} It was also reported that the group would have their own reality show on Mnet.{{cite web|last1=Hwang|first1=Mi-hyun|title=[단독]엠넷, '프듀101' 아이오아이(I.O.I) 리얼리티 기획|url=http://entertain.naver.com/read?oid=241&aid=0002545591|archive-url=https://archive.today/20160404022720/http://entertain.naver.com/read?oid=241&aid=0002545591|url-status=dead|archive-date=April 4, 2016|website=Naver|publisher=Ilgan Sports|access-date=April 3, 2016|language=ko}}{{cite web|last1=Hong|first1=Se-young|title=[단독] '택시', '프로듀스 101' 특집 준비 중… 첫 토크쇼|url=http://entertain.naver.com/ranking/read?oid=382&aid=0000463767&|website=Naver|publisher=Sports Donga|access-date=April 3, 2016|language=ko|archive-date=July 5, 2017|archive-url=https://web.archive.org/web/20170705093649/http://entertain.naver.com/ranking/read?oid=382&aid=0000463767&|url-status=live}} On the same day, the members greeted the fans for the first time as I.O.I via their official Naver V app channel.{{cite web|last1=Kim|first1=Ji-young|title=[V Report] I.O.I from 'Produce 101' kicks off V app broadcast|url=http://kpopherald.koreaherald.com/view.php?ud=201604041152197324047_2|website=Kpop Herald|access-date=April 4, 2016|archive-date=April 24, 2016|archive-url=https://web.archive.org/web/20160424133242/http://kpopherald.koreaherald.com/view.php?ud=201604041152197324047_2|url-status=live}}

{{main|Chrysalis (EP)}}

I.O.I officially debuted on May 4, 2016, through the release of their first album, Chrysalis, accompanied with a music video for the title track "Dream Girls". The song is a trap pop dance track co-written by Eru and Paul with rap lyrics written by members Lim Na-young and Choi Yoo-jung.{{cite web|last1=Shin|first1=Ji-soo|title=I.O.I "Dream Girls" Lyricist-Composer Turns Out to be Eru: Goes by the Name "Famous Bro"|url=http://news.mt.co.kr/mtview.php?no=2016050416155999428|website=Money Today|date=May 4, 2016 |access-date=May 4, 2016|archive-date=June 23, 2016|archive-url=https://web.archive.org/web/20160623202049/http://news.mt.co.kr/mtview.php?no=2016050416155999428|url-status=live}}{{cite web|last1=Jeon|first1=Su-mi|title=[Video] I.O.I Debuts and Releases 'Dream Girls' MV|url=http://mwave.interest.me/enewsworld/en/article/105102/|archive-url=https://archive.today/20161116122028/http://mwave.interest.me/enewsworld/en/article/105102/|url-status=dead|archive-date=November 16, 2016|website=Mwave|publisher=CJ E&M enewsWorld|access-date=May 4, 2016}} On May 5, the group held their debut stage on Mnet's M Countdown, performing the title track and "Knock Knock Knock".{{cite web|last1=Cho|first1=He-jin|title=I.O.I Shares Debut Selfie|url=http://mwave.interest.me/enewsworld/en/article/105123/|archive-url=https://archive.today/20161116122828/http://mwave.interest.me/enewsworld/en/article/105123/|url-status=dead|archive-date=November 16, 2016|website=Mwave|publisher=CJ E&M enewsWorld|access-date=May 27, 2016}} On the same day, the group held their debut showcase and fan meeting at Jangchung Gymnasium in Seoul.{{cite web|last=Kim|first=Soo-hyang|title=I.O.I from 'Produce 101' debuts May 4|url=http://kpopherald.koreaherald.com/view.php?ud=201604111123597639827_2|website=Kpop Herald|publisher=The Korea Herald|access-date=April 14, 2020|archive-date=July 17, 2020|archive-url=https://web.archive.org/web/20200717012326/http://kpopherald.koreaherald.com/view.php?ud=201604111123597639827_2|url-status=live}}

{{main|Whatta Man (I.O.I song)}}

File:I.O.I Seongnam Park 160616 (1).png

On June 10, 2016, YMC Entertainment revealed Lim Na-young, Chungha, Zhou Jieqiong, Kim So-hye, Choi Yoo-jung, Kim Do-yeon and Jeon So-mi as members of I.O.I's unit group, slated to promote the group's second album during the summer of 2016.{{cite web|last1=Park|first1=Hyun-min|title=아이오아이, 첫 유닛 확정…'전소미부터 김소혜'[공식입장]|url=http://entertain.naver.com/ranking/read?oid=109&aid=0003336048|website=Naver|publisher=OSEN|access-date=June 11, 2016|language=ko|archive-date=April 6, 2019|archive-url=https://web.archive.org/web/20190406031653/https://entertain.naver.com/ranking/read?oid=109&aid=0003336048|url-status=live}} Jung Chae-yeon joined her MBK Entertainment group DIA for a comeback, Kim Se-jeong and Kang Mi-na were preparing for their debut as members of Jellyfish Entertainment's girl group Gugudan at the time, and Yoo Yeon-jung was added into Starship Entertainment's girl group WJSN for their second comeback.{{cite web|last1=Park|first1=Pan-seok|title=다이아, 정채연·기희현 합류 확정..현재 뮤비 촬영중[공식입장]|url=http://entertain.naver.com/read?oid=109&aid=0003316205|website=Naver|publisher=OSEN|access-date=May 13, 2016|archive-date=July 5, 2017|archive-url=https://web.archive.org/web/20170705132802/http://entertain.naver.com/read?oid=109&aid=0003316205|url-status=live}}{{cite web|last1=Kim|first1=Ji-yeon|title=I.O.I′s Kim Sejeong and Kang Mina Confirmed for Jellyfish′s First Girl Group|url=http://mwave.interest.me/enewsworld/en/article/105913/|website=Mwave|publisher=CJ E&M enewsWorld|access-date=June 11, 2016}}{{Dead link|date=May 2019 |bot=InternetArchiveBot |fix-attempted=yes }}{{cite web|last1=Jeon|first1=Su Mi|title=Jellyfish Finally Announces New Girl Group Name|url=http://mwave.interest.me/enewsworld/en/article/106206/|website=Mwave|publisher=CJ E&M enewsWorld|access-date=June 17, 2016}}{{Dead link|date=May 2019 |bot=InternetArchiveBot |fix-attempted=yes }}

On August 9, 2016, the sub-unit released a single titled "Whatta Man (Good Man)". The song was inspired by Linda Lyndell's "What a Man" and was produced by Ryan S. Jhun who also composed I.O.I's song "Crush".{{cite web|last=Choi|first=Hyung-won|title=Watch: I.O.I Unit's new teaser (video)|url=http://kpopherald.koreaherald.com/view.php?ud=201608041403380464187_2|website=Kpop Herald|publisher=The Korea Herald|access-date=April 14, 2020|archive-date=July 16, 2020|archive-url=https://web.archive.org/web/20200716222549/http://kpopherald.koreaherald.com/view.php?ud=201608041403380464187_2|url-status=live}} The choreography for "Whatta Man" was arranged by member Chungha.{{cite web|last1=Kim|first1=Ye-na|title=[단독] '역시 춤꾼'…I.O.I 청하, 유닛 타이틀곡 안무 짰다|url=http://entertain.naver.com/read?oid=213&aid=0000895782|website=Naver|publisher=TV Report|access-date=August 22, 2016|language=ko|archive-date=December 25, 2020|archive-url=https://web.archive.org/web/20201225133301/https://entertain.naver.com/read?oid=213&aid=0000895782|url-status=live}}

On August 15, 2016, I.O.I released the digital single "Hand in Hand", a remake of the Seoul 1988 Summer Olympics theme song originally sung by Koreana.{{cite web|title=(싱글) 손에 손잡고|url=http://www.melon.com/album/detail.htm?albumId=2704322|website=MelOn|access-date=August 15, 2016|language=ko|archive-date=August 18, 2016|archive-url=https://web.archive.org/web/20160818073342/http://www.melon.com/album/detail.htm?albumId=2704322|url-status=live}}

{{main|Miss Me?}}

On October 17, 2016, I.O.I released their extended play titled Miss Me?. The title track, "Very Very Very", was written, composed and arranged by Park Jin-young, founder of Jeon So-mi's agency JYP Entertainment. With a rhythm of 206 bpm, the upbeat and energetic song is one of the fastest that Park has ever made.{{cite web|last1=Kim|first1=Yu-young|title=I.O.I gears up for stage return|url=http://www.koreaherald.com/view.php?ud=20161011000822|website=The Korea Herald|publisher=Herald Corporation|access-date=October 12, 2016|date=2016-10-11|archive-date=October 11, 2016|archive-url=https://web.archive.org/web/20161011200812/http://www.koreaherald.com/view.php?ud=20161011000822|url-status=live}}{{cite web|last1=Noh|first1=Yoon-jeong|title="오랜만의 완전체" 아이오아이, '너무너무너무' 티저 영상 공개|url=http://entertain.naver.com/read?oid=112&aid=0002856974|website=Naver|publisher=Herald Pop|access-date=October 14, 2016|language=ko|archive-date=August 11, 2017|archive-url=https://web.archive.org/web/20170811010311/http://entertain.naver.com/read?oid=112&aid=0002856974|url-status=live}} The group's special comeback show titled I Miss You Very Very Very Much Show was aired live through Mnet on October 16, 2016, followed by the release of Miss Me? and the title track's music video at midnight.{{cite web|last1=Park|first1=Pan-seok|title=완전체 아이오아이, 황금손 JYP 만나 귀여움 폭발..대박예감[V라이브 종합]|url=http://entertain.naver.com/read?oid=109&aid=0003413882|website=Naver|publisher=OSEN|access-date=October 16, 2016|language=ko|archive-date=August 10, 2017|archive-url=https://web.archive.org/web/20170810053229/http://entertain.naver.com/read?oid=109&aid=0003413882|url-status=live}}

I.O.I received their first music program trophy as a whole group with "Very Very Very" on Show Champion on October 26.{{cite web|last1=Cho|first1=He-jin|title=I.O.I Wins First Trophy as a Whole Group with 'Very Very Very'|url=http://mwave.interest.me/en/kpop-news/article/109605/|website=Mwave|publisher=CJ E&M enewsWorld|access-date=October 27, 2016}}{{Dead link|date=May 2019 |bot=InternetArchiveBot |fix-attempted=yes }}

On November 5, 2016, YMC Entertainment confirmed that I.O.I would be disbanding on January 31, 2017. The group would still be actively promoting until the end of their contracts; including guest appearance on variety shows such as Immortal Songs: Singing the Legend, Yang and Nam Show and Knowing Bros.{{cite web|last1=Jeon|first1=A-ram|title=아이오아이 측 "7일 '불후' 녹화…고별 무대는 아냐"|url=http://www.xportsnews.com/jenter/?ac=article_view&entry_id=786790|website=Xports News|publisher=Xports Media|access-date=November 29, 2016|language=ko|date=2016-11-05|archive-date=November 29, 2016|archive-url=https://web.archive.org/web/20161129150400/http://www.xportsnews.com/jenter/?ac=article_view&entry_id=786790|url-status=live}}{{cite web|last1=Kang|first1=Bo-ra|title=[POP스포] '불후의명곡' 아이오아이, 그녀들의 마지막 꽃길|url=http://entertain.naver.com/read?oid=112&aid=0002865785|website=Naver|publisher=Herald Pop|access-date=November 29, 2016|language=ko|archive-date=August 11, 2017|archive-url=https://web.archive.org/web/20170811011213/http://entertain.naver.com/read?oid=112&aid=0002865785|url-status=live}}{{cite web|last1=Kim|first1=Ji-ah|title='양남자쇼' 양세형, 아이오아이 선택 받고 토크 배틀 승리(종합)|url=http://entertain.naver.com/read?oid=112&aid=0002867251|website=Naver|publisher=Herald Pop|access-date=November 29, 2016|language=ko|archive-date=August 11, 2017|archive-url=https://web.archive.org/web/20170811011537/http://entertain.naver.com/read?oid=112&aid=0002867251|url-status=live}}{{cite web|title=아이오아이(IOI), '아는형님' 재출격 예고편 공개…"우리 안 보고싶었어?"|url=http://www.honam.co.kr/read.php3?aid=1480254185509220215|archive-url=https://web.archive.org/web/20190112095051/http://www.honam.co.kr/read.php3?aid=1480254185509220215|url-status=dead|archive-date=January 12, 2019|website=Honam|publisher=Moodeung Ilbo|access-date=November 29, 2016|language=ko}} From January 20 to 22, 2017, I.O.I held their final concert titled Time Slip – I.O.I. The three-day concert was held in Jangchung Gymnasium, where the group held their debut showcase.{{cite web|last1=Park|first1=Hyeon-min|title=[단독] 아이오아이, 마지막은 콘서트..내년 1월 '타임슬립' 확정|url=http://entertain.naver.com/read?oid=109&aid=0003439236|website=Naver|publisher=OSEN|access-date=November 29, 2016|language=ko|archive-date=August 11, 2017|archive-url=https://web.archive.org/web/20170811011312/http://entertain.naver.com/read?oid=109&aid=0003439236|url-status=live}}

File:161219 불빛거리 출정식 아이오아이 직찍 업로드 (1).jpg

On January 10, 2017, it was revealed that I.O.I had received songs from various producers and songwriters as potential songs for their final release, including B1A4's Jinyoung.{{cite web|last1=Yoon|first1=Joon-pil|url=http://tenasia.hankyung.com/archives/1107084|title=아이오아이 측 "B1A4 진영 곡, 가이드 녹음만…정해진 것 無"(공식입장)|website=TenAsia|access-date=January 18, 2017|language=ko|date=2017-01-10|archive-date=January 18, 2017|archive-url=https://web.archive.org/web/20170118222344/http://tenasia.hankyung.com/archives/1107084|url-status=live}}{{cite web|last1=Lee|first1=Da-won|url=http://star.mbn.co.kr/view.php?no=21301|title=I.O.I 측 "진영 곡 가이드 녹음만…타이틀 아직 미정"(공식입장)|website=MBN Star|publisher=Maeil Broadcasting Network|access-date=January 18, 2017|language=ko|archive-date=January 18, 2017|archive-url=https://web.archive.org/web/20170118230352/http://star.mbn.co.kr/view.php?no=21301|url-status=live}}{{cite web|last1=Min|first1=Susan|url=http://mwave.interest.me/en/kpop-news/article/111597/|title=I.O.I to Collaborate with B1A4's Jin Young for Last Song|website=Mwave|access-date=January 14, 2017}}{{Dead link|date=May 2019 |bot=InternetArchiveBot |fix-attempted=yes }} On January 17, YMC Entertainment announced that the group's final track before official disbandment would be "Downpour", written and co-produced by Seventeen's Woozi. The ballad was personally chosen and recorded by all eleven members of the group. The digital single and its music video was released the next day at midnight.{{cite web|last1=Jeon|first1=Won|url=http://entertain.naver.com/now/read?oid=117&aid=0002864834|title=세븐틴 우지, IOI 마지막곡 '소나기' 작사·작곡 "추억으로 남는 노래"|website=Naver|publisher=My Daily|access-date=January 17, 2017|language=ko|archive-date=June 23, 2020|archive-url=https://web.archive.org/web/20200623045013/https://entertain.naver.com/now/read?oid=117&aid=0002864834|url-status=live}}{{cite web|last1=Min|first1=Susan|url=http://mwave.interest.me/en/kpop-news/article/111816/|title=I.O.I to Release Final Single Written By Seventeen's Woozi|website=Mwave|access-date=January 17, 2017}}{{Dead link|date=May 2019 |bot=InternetArchiveBot |fix-attempted=yes }}{{cite web|last1=Min|first1=Susan|url=http://mwave.interest.me/en/kpop-news/article/111823/|title=I.O.I's 'Downpour' Achieves Music Chart All-Kill|website=Mwave|access-date=January 18, 2017}}{{Dead link|date=May 2019 |bot=InternetArchiveBot |fix-attempted=yes }}

I.O.I's last schedule as a group was on January 25, 2017. They filmed a new CF for school uniform brand Elite along with boy group Pentagon.{{cite web|last1=Hwang|first1=Ji-young|url=http://entertain.naver.com/now/read?oid=241&aid=0002634025|title=[단독] 아이오아이, 진짜 마지막은 완전체 광고촬영 '꽃길엔딩'|website=Naver|publisher=Ilgan Sports|access-date=January 23, 2017|language=ko}}{{dead link|date=June 2018 |bot=Redalert2fan |fix-attempted=yes }}{{cite web|last1=Moon|first1=Wan-sik|url=http://entertain.naver.com/read?oid=108&aid=0002586500|title=[단독]'아듀' 아이오아이..25일 광고촬영 끝 266일 활동 마감|website=Naver|publisher=Star News|access-date=January 28, 2017|language=ko|archive-date=July 31, 2017|archive-url=https://web.archive.org/web/20170731163130/http://entertain.naver.com/read?oid=108&aid=0002586500|url-status=live}} The band officially disbanded on January 29, with the members' last television show appearance on MBC's Section TV and the fan cafe closing down on the 31st.{{cite web|last1=Lee|first1=Sang-cheol|url=http://www.cbci.co.kr/news/articleView.html?idxno=297900|title=[단독]아이오아이(I.O.I), 오는 29일부로 프로젝트 활동 마치며 공식적인 해체..'너무 아쉬운 이별'|website=CBC News|access-date=January 28, 2017|language=ko|date=2017-01-22|archive-date=March 27, 2019|archive-url=https://web.archive.org/web/20190327090833/http://www.cbci.co.kr/news/articleView.html?idxno=297900|url-status=live}}{{cite web|last1=Lee|first1=Ah-young|url=http://entertain.naver.com/read?oid=311&aid=0000698026|title='섹션' 아이오아이, 마지막 스케줄에 눈물…"5년 뒤 꼭 만나자"|website=Naver|publisher=Xports News|access-date=January 29, 2017|language=ko|archive-date=August 11, 2017|archive-url=https://web.archive.org/web/20170811010704/http://entertain.naver.com/read?oid=311&aid=0000698026|url-status=live}} It was also announced on January 31 that I.O.I's song "Downpour" won Inkigayo's final January 2017 trophy with no live broadcast due to Lunar New Year's Day.{{cite web|last1=Min|first1=Susan|url=http://mwave.interest.me/en/kpop-news/article/112150/|title=I.O.I Takes Home 'Inkigayo' Trophy With 'Downpour'|website=Mwave|access-date=January 31, 2017}}{{Dead link|date=May 2019 |bot=InternetArchiveBot |fix-attempted=yes }}

On July 1, 2019, Studio Blu confirmed that the group would return in October 2019 with nine members, excluding Yoo Yeon-jung and Jeon So-mi.{{cite web |title=아이오아이, 10월 9인조로 재결합…"전소미·유연정도 응원할 것" [공식입장 전문] |url=https://entertain.naver.com/now/read?oid=311&aid=0001011810 |website=entertain.naver.com |access-date=July 1, 2019 |language=ko |date=July 1, 2019 |archive-date=July 1, 2019 |archive-url=https://web.archive.org/web/20190701153733/https://entertain.naver.com/now/read?oid=311&aid=0001011810 |url-status=live }}{{cite web |title=Girl band I.O.I gets back together for new album in Oct. |url=https://en.yna.co.kr/view/AEN20190701009200315 |website=Yonhap News Agency |access-date=July 2, 2019 |language=en |date=July 2, 2019 |archive-date=July 2, 2019 |archive-url=https://web.archive.org/web/20190702092726/https://en.yna.co.kr/view/AEN20190701009200315 |url-status=live }} On September 6, the planned comeback was postponed to December.{{cite web |title=[단독]아이오아이, 12월로 컴백 연기...'11인조 완전체로 돌아오나?' |url=https://entertain.naver.com/now/read?oid=468&aid=0000559070 |website=entertain.naver.com |access-date=September 6, 2019 |language=ko |date=September 6, 2019 |archive-date=July 20, 2020 |archive-url=https://web.archive.org/web/20200720020825/https://entertain.naver.com/now/read?oid=468&aid=0000559070 |url-status=live }} On October 29, the comeback was canceled due to scheduling conflicts between the members and the ongoing Mnet vote manipulation investigation.{{cite web |title=[단독]아이오아이, 주결경도 '합류 불투명'...12월 재결합 무산 위기 |url=https://entertain.naver.com/read?oid=468&aid=0000583767 |website=entertain.naver.com |access-date=October 29, 2019 |language=ko |date=October 29, 2019 |archive-date=July 18, 2020 |archive-url=https://web.archive.org/web/20200718090937/https://entertain.naver.com/read?oid=468&aid=0000583767 |url-status=live }} On May 4, 2021, the 5th anniversary of the group's debut, the group (except for Mina and Jieqiong) held a reunion livestream.{{Cite web|date=2021-04-13|title=아이오아이, 5월 4일 '데뷔 5주년' 기념 한자리…약속 지켰다 [종합]|url=https://star.mt.co.kr/stview.php?no=2021041315111066720|access-date=2021-04-15|website=스타뉴스|language=ko|archive-date=April 15, 2021|archive-url=https://web.archive.org/web/20210415072436/https://star.mt.co.kr/stview.php?no=2021041315111066720|url-status=live}} Jieqiong managed to join the livestream via video calling.{{Cite news|last=Jeong|first=Heeyeon|date=2021-05-04|title=[종합] 아이오아이 데뷔 5주년 라이브 "함께 활동하고파"|work=스포츠동아|url=https://sports.donga.com/article/all/20210504/106769396/1|access-date=2021-05-04|archive-date=May 14, 2021|archive-url=https://web.archive.org/web/20210514191643/https://sports.donga.com/article/all/20210504/106769396/1|url-status=live}}

• Lim Na-young ({{lang|ko|임나영}}) – leader{{cite web|url=https://n.news.naver.com/entertain/article/108/0002515699|title=[단독]임나영, 아이오아이(I.O.I) '리더' 됐다...11인 투표 선정|date=April 7, 2016|website=Naver|language=ko|access-date=March 21, 2022|archive-date=March 21, 2022|archive-url=https://web.archive.org/web/20220321121229/https://n.news.naver.com/entertain/article/108/0002515699|url-status=live}}
• Kim Chung-ha ({{lang|ko|김청하}})
• Kim Se-jeong ({{lang|ko|김세정}})
• Jung Chae-yeon ({{lang|ko|정채연}})
• Zhou Jieqiong ({{lang|ko|주결경}})
• Kim So-hye ({{lang|ko|김소혜}})
• Yoo Yeon-jung ({{lang|ko|유연정}})
• Choi Yoo-jung ({{lang|ko|최유정}})
• Kang Mi-na ({{lang|ko|강미나}})
• Kim Do-yeon ({{lang|ko|김도연}})
• Jeon So-mi ({{lang|ko|전소미}})

• I.O.I sub-unit – Nayoung, Chungha, Jieqiong, Sohye, Yoojung, Doyeon, and Somi

{{#tag:timeline|

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• Time Slip – I.O.I (2017)

• Produce 101 (2016)
• Standby I.O.I (2016){{cite web|last1=Lee|first1=Yong-soo|title=아이오아이, 데뷔 과정 담는 '스탠바이 아이오아이' 오는 22일 편성|url=http://entertain.naver.com/now/read?oid=468&aid=0000137561|website=Naver|publisher=Sports Seoul|access-date=April 15, 2016|language=ko|archive-date=July 5, 2017|archive-url=https://web.archive.org/web/20170705124052/http://entertain.naver.com/now/read?oid=468&aid=0000137561|url-status=live}}
• LAN Cable Friends I.O.I (2016){{cite web|last1=Ko|first1=Sujin|title=[Video] I.O.I Featured in First 'LAN Cable Friends I.O.I' Trailer|url=http://mwave.interest.me/en/kpop-news/article/106717/|website=Mwave|publisher=CJ E&M enewsWorld|access-date=November 29, 2016}}{{Dead link|date=July 2019 |bot=InternetArchiveBot |fix-attempted=yes }}
• I Miss You Very Very Very Much Show (2016)

It was reported on March 24, 2016, that even before the finale of Produce 101, the group already confirmed seven CF deals for different companies with an estimated profit of ₩1.4 billion.{{cite web|last1=Hwang|first1=Mi-hyeon|title=[분석is]잭팟 '프로듀스101', CF 7개 확정..모델료 2억 돌파|url=http://media.daum.net/m/entertain/newsview/20160324100206957|website=Daum|publisher=Ilgan Sports|access-date=April 2, 2016|language=ko|archive-date=April 14, 2016|archive-url=https://web.archive.org/web/20160414183509/http://media.daum.net/m/entertain/newsview/20160324100206957|url-status=live}}

On April 4, 2016, I.O.I was appointed as new model for Etude House, Mom's Touch Chicken and Burger, Woongjin Foods' Haneul Bori Ice Sparkling Water and HiteJinro's Chamisul.{{cite web|last1=Jeon|first1=Won|title=[단독] 아이오아이, 에뛰드 모델 됐다…단숨에 톱 걸그룹 등극|url=http://entertain.naver.com/read?oid=117&aid=0002746125|website=Naver|publisher=My Daily|access-date=April 5, 2016|language=ko|archive-date=July 5, 2017|archive-url=https://web.archive.org/web/20170705085235/http://entertain.naver.com/read?oid=117&aid=0002746125|url-status=live}} However, due to the legal drinking age in South Korea, only three members, Lim Na-young, Chungha and Kim Se-jeong, were involved in filming of the ad for a new alcoholic beverage by distiller HiteJinro.{{cite web|last1=Son|first1=Ji-hyoung|title=I.O.I endorses new peach alcoholic drink|url=http://kpopherald.koreaherald.com/view.php?ud=201604051457343761854_2|website=Kpop Herald|access-date=April 5, 2016|archive-date=September 22, 2016|archive-url=https://web.archive.org/web/20160922210239/http://kpopherald.koreaherald.com/view.php?ud=201604051457343761854_2|url-status=live}}{{cite web|last1=Kim|first1=Yoo-jin|title='프로듀스 101' I.O.I, 주류 CF 촬영 "20세 넘긴 3명만"|url=http://entertain.naver.com/read?oid=421&aid=0001982851|website=Naver|publisher=News1|access-date=April 5, 2016|language=ko|archive-date=July 5, 2017|archive-url=https://web.archive.org/web/20170705080358/http://entertain.naver.com/read?oid=421&aid=0001982851|url-status=live}}

On April 11, 2016, I.O.I was chosen as the advertising model for mobile games from Netmarble, 100 Shots 100 Hits and StoneAge. They also sang the OST of the games.{{cite web|last1=Park|first1=Sang-jin|title=넷마블, 게임 3종 광고모델로 프로듀스101 아이오아이' 발탁|url=http://game.xportsnews.com/?ac=article_view&entry_id=712279|website=Xports News Game|publisher=Xports News|access-date=April 11, 2016|language=ko|url-status=dead|archive-url=https://web.archive.org/web/20160420133251/http://game.xportsnews.com/?ac=article_view&entry_id=712279|archive-date=April 20, 2016}} The next day, the group was confirmed as the new endorser for SK Telecom, South Korea's largest wireless carrier.{{cite web|title=[단독] 아이오아이, 데뷔 전 SKT 얼굴 됐다…확실한 대세|last1=Kim|first1=Ye-na|url=http://entertain.naver.com/read?oid=213&aid=0000863471|website=Naver|publisher=TV Report|access-date=April 12, 2016|language=ko|archive-date=July 5, 2017|archive-url=https://web.archive.org/web/20170705134135/http://entertain.naver.com/read?oid=213&aid=0000863471|url-status=live}}

I.O.I also endorsed CJ CheilJedang's dessert brand Petitzel Eclairs and Korean fashion brand Pancoat.{{cite web|last1=Min|first1=Susan|title=[Video] I.O.I Looks Adorable in New 'Petitzel Eclairs' CF|url=http://mwave.interest.me/enewsworld/en/article/105869/ioi-looks-adorable-in-new-petitzel-eclairs-cf-kpop-girl-groups|website=Mwave|publisher=CJ E&M enewsWorld|access-date=June 11, 2016|archive-url=https://web.archive.org/web/20160607024736/http://mwave.interest.me/enewsworld/en/article/105869/ioi-looks-adorable-in-new-petitzel-eclairs-cf-kpop-girl-groups|archive-date=June 7, 2016|url-status=dead}}{{cite web|last1=Park|first1=So-hyun|title=I.O.I, 패션 브랜드 모델 발탁 '대세입증'|url=http://www.xportsnews.com/jeco/?ac=article_view&entry_id=717823&|website=Xportsnews|access-date=June 11, 2016|language=ko|date=2016-04-27|archive-date=October 6, 2016|archive-url=https://web.archive.org/web/20161006175408/http://www.xportsnews.com/jeco/?ac=article_view&entry_id=717823&|url-status=live}}

On May 25, 2016, I.O.I was appointed as the promotional models for KB Kookmin Bank, one of the largest banks in South Korea. On June 7, 2016, the group was chosen as the exclusive models of online marketplace Auction.{{cite web|title=KB국민은행, 걸그룹 아이오아이(I.O.I)와 광고모델 계약 체결|url=http://entertain.naver.com/now/read?oid=003&aid=0007248719|website=Naver|publisher=Newsis|access-date=June 11, 2016|language=ko|archive-date=July 17, 2020|archive-url=https://web.archive.org/web/20200717183233/https://entertain.naver.com/now/read?oid=003&aid=0007248719|url-status=live}}{{cite web|title=아이오아이, 옥션 새 모델로…"젊고 친근한 이미지로 다양한 연령층 공감 얻어낼 것"|last1=Jeong|first1=Yoo-jin|url=http://www.asiae.co.kr/news/view.htm?sec=ent99&idxno=2016060714552657899|website=Asiae|access-date=June 11, 2016|language=ko|date=2016-06-07|archive-date=July 1, 2016|archive-url=https://web.archive.org/web/20160701210408/http://www.asiae.co.kr/news/view.htm?sec=ent99&idxno=2016060714552657899|url-status=live}}

On August 18, 2016, school uniform brand Elite announced their collaboration with I.O.I and Pentagon as their new models.{{cite web|last1=Yoo|first1=Joo-yeon|title=[화보] 아이오아이, 교복이 가장 잘 어울리는 아이돌 입증|url=http://entertain.naver.com/read?oid=144&aid=0000447707|website=Naver|publisher=Kyunghyang Shinmun|access-date=September 28, 2016|language=ko|archive-date=August 19, 2017|archive-url=https://web.archive.org/web/20170819022951/http://entertain.naver.com/read?oid=144&aid=0000447707|url-status=live}}

{{Reflist|30em}}

{{Commons category|I.O.I}}

• {{Official website|https://web.archive.org/web/20190804191739/http://www.ymcent.com/YMC/artist_ioi.php}} {{in lang|ko}}

{{I.O.I}}

{{Produce 101}}

{{Golden Disk Awards for New Artist of the Year}}

{{MAMA Award for Best New Artist}}

{{Seoul Music Awards for New Artist Award}}

{{Authority control}}

0

Category:K-pop music groups

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Category:2016 establishments in South Korea

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Category:2017 disestablishments in South Korea