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I.O.I in October 2016 From left to right: Nayoung, Yeonjung, Mina, Jieqiong, Chaeyeon, Somi, Sejeong, Chungha, Yoojung, Sohye and Doyeon
I.O.I in October 2016
From left to right: Nayoung, Yeonjung, Mina, Jieqiong, Chaeyeon, Somi, Sejeong, Chungha, Yoojung, Sohye and Doyeon
Background information
OriginSeoul, South Korea
Years active2016 (2016)–2017
Associated acts
WebsiteOfficial website
Past members

I.O.I (Korean아이오아이; also known as IOI[1] or Ideal of Idol[2]) was a South Korean girl group formed by CJ E&M through the 2016 reality show Produce 101 on Mnet. The group was composed of eleven members chosen from a pool of 101 trainees from various entertainment companies: Lim Na-young, Kim Chung-ha, Kim Se-jeong, Jung Chae-yeon, Zhou Jieqiong, Kim So-hye, Yoo Yeon-jung, Choi Yoo-jung, Kang Mi-na, Kim Do-yeon and Jeon So-mi. They debuted on May 4, 2016 with the EP Chrysalis and actively promoted as a whole and as a sub-unit for less than a year.

The group's concert titled Time Slip – I.O.I, which was held on January 20 to 22, 2017, marked their last group activity on stage. They officially disbanded at the end of January 2017 and returned to their respective agencies.


Pre-debut: Produce 101 and "Crush"[edit]

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.[3][4]

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.[5][6][7] 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.[8][9]

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.[10] Its genre was referred to as "Trapical Dutch Funk" (Hangul: 트래피컬 더치 펑크).[11]

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.[12] It was also reported that the group would have their own reality show on Mnet.[13][14] On the same day, the members greeted the fans for the first time as I.O.I via their official Naver V app channel.[15]

Debut with Chrysalis[edit]

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.[16][17] On May 5, the group held their debut stage on Mnet's M Countdown, performing the title track and "Knock Knock Knock".[18] On the same day, the group held their debut showcase and fan meeting at Jangchung Gymnasium in Seoul.[19]

"Whatta Man" and "Hand in Hand"[edit]

I.O.I on July 16, 2016

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.[20] Jung Chae-yeon joined her MBK Entertainment group DIA for a comeback, and Kim Se-jeong and Kang Mi-na were preparing for their debut as members of Jellyfish Entertainment's girl group Gugudan at the time.[21][22][23]

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".[24] The choreography for "Whatta Man" was arranged by member Chungha.[25]

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.[26]

Miss Me?[edit]

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.[27][28] 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.[29]

I.O.I received their first music program trophy as a whole group with "Very Very Very" on Show Champion on October 26.[30]

Last activities, final concert and disbandment[edit]

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.[31][32][33][34] 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.[35]

I.O.I's unit group in December 2016

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.[36][37][38] 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.[39][40][41]

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.[42][43] 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.[44][45] 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.[46]

Planned reunion[edit]

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.[47][48] On September 6, the planned comeback was postponed to December.[49] On October 29, the comeback has been canceled due to scheduling conflicts between the members and the ongoing Mnet vote manipulation investigation.[50]



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


Extended plays[edit]


  • Time Slip – I.O.I (2017)


Reality Shows[edit]

  • Produce 101 (2016)
  • Standby I.O.I (2016)[51]
  • LAN Cable Friends I.O.I (2016)[52]
  • I Miss You Very Very Very Much Show (2016)[29]


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.[53]

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.[54] 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.[55][56]

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.[57] The next day, the group was confirmed as the new endorser for SK Telecom, South Korea's largest wireless carrier.[58]

I.O.I also endorsed CJ CheilJedang's dessert brand Petitzel Eclairs and Korean fashion brand Pancoat.[59][60]

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.[61][62]

On August 18, 2016, school uniform brand Elite announced their collaboration with I.O.I and Pentagon as their new models.[63]

Awards and nominations[edit]


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  2. ^ Lee, Jeong-min. "[오마이포토] 아이오아이, 드디어 세상 속으로!". Nate (in Korean). Oh My News. Retrieved May 6, 2016.
  3. ^ Seon, Mi-kyung. "'프로듀스101' 전소미, 1위 지켰다…이변없는 I.O.I 멤버 11인 확정[종합]". Nate (in Korean). OSEN. Retrieved April 2, 2016.
  4. ^ Kim, Do-hyeong. "'프로듀스 101' 최종 1위 전소미…11위 유연정 '데뷔 확정' (종합)". Nate (in Korean). Sports Seoul. Retrieved April 2, 2016.
  5. ^ "K팝스타2 김세정,박소연,김민정 폭풍성장(프로듀스101)". Instiz (in Korean). October 20, 2018. Retrieved April 2, 2016.
  6. ^ Kim, Hyeon-min (December 18, 2015). "'프로듀스 101', 14명의 소녀들 소개 영상…'트와이스' 소미 지원사격". Herald Pop (in Korean). Retrieved April 2, 2016.
  7. ^ Kim, Ji-hye (December 18, 2015). "'프로듀스101′ 전소미, 두 번째 오디션 도전…트와이스 지원사격 '의리'". Tenasia (in Korean). Retrieved April 2, 2016.
  8. ^ Jeong, Yoo-jin. "다이아 측 "채연•캐시 잠정 탈퇴..'프로듀스' 합류" [공식입장]". Naver (in Korean). OSEN. Retrieved April 2, 2016.
  9. ^ Jeong, Yoo-jin (December 22, 2015). "다이아 채연•캐시, '프로듀스 101' 합류 하면서 잠정탈퇴…"새로운 도전"". MBN News (in Korean). Retrieved April 2, 2016.
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  32. ^ Kang, Bo-ra. "[POP스포] '불후의명곡' 아이오아이, 그녀들의 마지막 꽃길". Naver (in Korean). Herald Pop. Retrieved November 29, 2016.
  33. ^ Kim, Ji-ah. "'양남자쇼' 양세형, 아이오아이 선택 받고 토크 배틀 승리(종합)". Naver (in Korean). Herald Pop. Retrieved November 29, 2016.
  34. ^ "아이오아이(IOI), '아는형님' 재출격 예고편 공개…"우리 안 보고싶었어?"". Honam (in Korean). Moodeung Ilbo. Archived from the original on January 12, 2019. Retrieved November 29, 2016.
  35. ^ Park, Hyeon-min. "[단독] 아이오아이, 마지막은 콘서트..내년 1월 '타임슬립' 확정". Naver (in Korean). OSEN. Retrieved November 29, 2016.
  36. ^ Yoon, Joon-pil (January 10, 2017). "아이오아이 측 "B1A4 진영 곡, 가이드 녹음만…정해진 것 無"(공식입장)". TenAsia (in Korean). TenAsia. Retrieved January 18, 2017.
  37. ^ Lee, Da-won. "I.O.I 측 "진영 곡 가이드 녹음만…타이틀 아직 미정"(공식입장)". MBN Star (in Korean). MBN. Retrieved January 18, 2017.
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External links[edit]