Hangul: 아이오아이

Alternative name: アイ・オー・アイ

Origin: South Korea

Debut Date: May 04, 2016

I.O.I Members

About I.O.I

I.O.I Member Ages

Ranked from oldest to youngest.

1. NayoungDec 18, 199527 years old
2. ChunghaFeb 09, 199627 years old
3. SejeongAug 28, 199626 years old
4. ChaeyeonDec 01, 199725 years old
5. KyulkyungDec 16, 199824 years old
6. SohyeJul 19, 199923 years old
7. YeonjungAug 03, 199923 years old
8. YoojungNov 12, 199923 years old
9. DoyeonDec 04, 199923 years old
10. MinaDec 04, 199923 years old
11. SomiMar 09, 200122 years old

I.O.I Member Heights

Ranked from tallest to shortest.

1. Doyeon1.73 m (5’8″)
2. Somi1.72 m (5’8″)
3. Nayoung1.71 m (5’7″)
4. Yeonjung1.67 m (5’6″)
5. Chaeyeon1.66 m (5’5″)
6. Kyulkyung1.66 m (5’5″)
7. Sejeong1.64 m (5’5″)
8. Sohye1.63 m (5’4″)
9. Mina1.62 m (5’4″)
10. Chungha1.61 m (5’3″)
11. Yoojung1.57 m (5’2″)


I.O.I is composed of eleven members born between 1995 and 2001. Their names are: Nayoung, Chungha, Sejeong, Chaeyeon, Kyulkyung, Sohye, Yeonjung, Yoojung, Mina, Doyeon, and Somi.

The oldest member and leader of I.O.I is Nayoung (born Dec 18, 1995). The youngest member (maknae) of I.O.I is Somi (born Mar 9, 2001).

All of the members are Korean except for Kyulkyung (aka Jieqiong) who is Chinese.


Nayoungleader, main rapper, lead dancer, vocalist
Chunghamain dancer, lead vocalist, rapper
Sejeongmain vocalist
Chaeyeonvisual, vocalist
Kyulkyunglead dancer, visual, vocalist
Sohyerapper, vocalist
Yeonjungmain vocalist
Yoojunglead rapper, lead dancer, lead vocalist
Minalead dancer, vocalist, rapper
Doyeonvocalist, visual
Somilead vocalist, lead dancer, center, maknae

I.O.I Final Ranking


Fun Facts and Trivia

  • The oldest member and leader of I.O.I is Nayoung (born Dec 18, 1995).
  • The youngest member (maknae) of I.O.I is Somi (born Mar 9, 2001).
  • Mina and Doyeon share the exact same birthday (Dec 4, 1999).
  • The main dancer of I.O.I is Chungha.

Members’ Profiles

1. Nayoung

  • Stage Name: Nayoung
  • Full Name: Lim Na Young
  • Native Name: 임나영
  • Birth Place: Korea
  • Birthday: Dec 18, 1995
  • Height: 171 cm (5’7″)
  • Weight: 50 kg (110 lbs)
  • Blood Type: O
  • Zodiac: Sagittarius

2. Chungha

  • Stage Name: Chungha
  • Full Name: Kim Chan Mi
  • Native Name: 김찬미
  • Birth Place: Korea
  • Birthday: Feb 9, 1996
  • Height: 161 cm (5’3″)
  • Weight: 44 kg (97 lbs)
  • Blood Type: B
  • Zodiac: Aquarius

3. Sejeong

  • Stage Name: Sejeong
  • Full Name: Kim Se Jeong
  • Native Name: 김세정
  • Birth Place: Korea
  • Birthday: Aug 28, 1996
  • Height: 164 cm (5’5″)
  • Weight: 48 kg (106 lbs)
  • Blood Type: AB
  • Zodiac: Virgo

4. Chaeyeon

  • Stage Name: Chaeyeon
  • Full Name: Jung Chae Yeon
  • Native Name: 정채연
  • Birth Place: Korea
  • Birthday: Dec 1, 1997
  • Height: 166 cm (5’5″)
  • Weight: 49 kg (108 lbs)
  • Blood Type: A
  • Zodiac: Sagittarius

5. Kyulkyung

  • Stage Name: Kyulkyung
  • Full Name: Zhou Jie Qiong
  • Native Name: 周洁琼
  • Birth Place: China
  • Birthday: Dec 16, 1998
  • Height: 167 cm (5’6″)
  • Weight: 48 kg (106 lbs)
  • Blood Type: O
  • Zodiac: Sagittarius

6. Sohye

  • Stage Name: Sohye
  • Full Name: Kim So Hye
  • Native Name: 김소혜
  • Birth Place: Korea
  • Birthday: Jul 19, 1999
  • Height: 166 cm (5’5″)
  • Weight: 48 kg (106 lbs)
  • Blood Type: A
  • Zodiac: Cancer

7. Yeonjung

  • Stage Name: Yeonjung
  • Full Name: Yu Yeon Jung
  • Native Name: 유연정
  • Birth Place: Korea
  • Birthday: Aug 3, 1999
  • Height: 168 cm (5’6″)
  • Weight: 42 kg (93 lbs)
  • Blood Type: A
  • Zodiac: Leo

8. Yoojung

  • Stage Name: Yoojung
  • Full Name: Choi Yoo Jung
  • Native Name: 최유정
  • Birth Place: Korea
  • Birthday: Nov 12, 1999
  • Height: 157 cm (5’2″)
  • Weight: 44 kg (97 lbs)
  • Blood Type: O
  • Zodiac: Scorpio

9. Mina

  • Stage Name: Mina
  • Full Name: Kang Mi Na
  • Native Name: 강미나
  • Birth Place: Korea
  • Birthday: Dec 4, 1999
  • Height: 164 cm (5’5″)
  • Weight: 42 kg (93 lbs)
  • Blood Type: O
  • Zodiac: Sagittarius

10. Doyeon

  • Stage Name: Doyeon
  • Full Name: Kim Do Yeon
  • Native Name: 김도연
  • Birth Place: Korea
  • Birthday: Dec 4, 1999
  • Height: 173 cm (5’8″)
  • Weight: 50 kg (110 lbs)
  • Blood Type: O
  • Zodiac: Sagittarius

11. Somi

  • Stage Name: Somi
  • Full Name: Jeon So Mi
  • Native Name: 전소미
  • Birth Place: Korea
  • Birthday: Mar 9, 2001
  • Height: 172 cm (5’8″)
  • Weight: 48 kg (106 lbs)
  • Blood Type: O
  • Zodiac: Pisces


  • The members were selected through the PRODUCE 101 program.
  • The last chapter of PRODUCE 101; in the final election of the members achieved a 4.38 % ranking; being the highest of the survival programs.
  • Fans and even non-fans of AOA demand that I.O.I should change its group name, as IOI (aioai) is quite similar to AOA (eioei).
  • So Mi had the central position of the group, as she came first in the last chapter of PRODUCE 101.
  • Many netizens have been concerned that the group only has 3 female rappers: Nayoung, Yoojung and Mina.
  • On April 4, I.O.I had their first official activity on VLive app, but it only lasted 5 minutes. In their 5 minutes of transmission they got more than 800 000 likes; currently they have more.
  • According to a representative, only 3 I.O.I members were chosen to promote Hite Beer (alcoholic beverage). Excluding the underage members; the reporter only knew the names of Somi and Pinky that’s why when they mentioned the underage members they only mentioned them, causing controversy for the rest of the underage members in the group, but they fixed it.
  • On April 4, it was reported that they have signed several commercial contracts (CF) with top companies in South Korea, including a chicken restaurant franchise, a beauty brand, an energy drink and an alcoholic beverage.
  • On April 4, they released a fanservice video for Crush on Naver as a token of love to their fans for their support, which shows them having a lot of fun with the song, as well as the recording scenes. Crush will be part of one of the songs in the mini album, but it is not the debut song.
  • After the release of the song Crush, it ranked #1 on Mnet, Soribada and Monkey3; #2 on Bugs and Olleh; #5 on Naver and #8 on Melon in real time chart.
  • In less than a day, the video of Crush (1st version) got more than 1 million views on Naver; it also ranked #3 on the Intiz Chart.
  • Crush’s video ranked #1 as the most watched video on Melon (2 consecutive weeks).
  • The debut mini album will be managed by Loen Entertaiment.
  • It was revealed on April 7 that the members themselves voted for who they wanted to be their leader. Ultimately it was the oldest member, Nayoung, who received the most votes and was awarded the leadership position.
  • On April 16, they opened their official Facebook and Instagram.
  • The first television program in which they participated even without having debuted was Sugar Man. The group won the duel against Jessi with a good score; it was also known that the program had the highest rating with 3.911%.
  • The cover of HIP SONG that they performed at Sugar Man surpassed 1 million views on Naver in less than 24 hours; it also became the most viewed video of the show.
  • On April 26, according to representatives of the all-female group, the group will be donating all ticket proceeds from their showcase.
  • Na Young and Yoo Jung participated in the lyrics of “Dream Girls” and the intro “I.O.I” of their debut mini album.
  • Her debut MV “Dream Girls” reached 1 million views within 17 hours of its release.
  • I.O.I sold more than 25 thousand copies of his mini album in the 1st week.
  • Somi could not participate in KCON France, because YMC did not take out a special permit in advance due to the fact that Somi is a minor. The company regretted what happened and said that this would not happen at KCON Los Angeles; she was seen in the streets of Paris, she took many photos with fans and even gave autographs, she said she regretted not being able to perform together with her group mates.
  • Chung Ha participated in creating the choreography for ‘Whatta Man (Good Man)’.
  • Whatta Man within a few hours of being unveiled debuted at #2 on Melon, Soribada, Naver, Monkey, Bugs and Olleh. And at #1 on Mnet. In just one day it achieved 1.5 million views.
  • Within a couple of minutes of its release “Very very very very” was #1 on several charts and within a couple of hours “Perfect All Kill” was #1 on all Korean charts such as Melon, Mnet, Naver, etc.
  • His MV “Very very very” got 1,070,310 views within 12 hours of being released.
  • The choreography of “Very very very” was done by 1 Million’s choreographer and dance trainer Lia Kim where she has posted on her official YouTube channel where she teaches I.O.I the choreography of her new song.
  • I.O.I is recently gaining fans for their talents and personalities. But as soon as they have finally established a reputation in the entertainment industry. The group had to say goodbye with the date of their disbandment. They presented “Very Very Very” in their final stage as a group at KBS Music Bank on November 4.
  • Fans feared the last stage performance and were saddened when it finally happened. During the performance of their song in “Music Bank,” the girls changed a part of their original choreography and instead bowed to show their appreciation to the fans who have been with them until the end. Fans have continued to express their support through SNS with the hashtag #IOIForever, even calling for the dissolution to be cancelled.
  • Their official separation will take place on January 31, 2017.
  • They will hold a series of concerts on January 20, 21 and 22 in order to bid farewell to the fans before their official disintegration.
  • Their song ‘DOWNPOUR’ was written and composed by Woozi of SEVENTEEN.
  • They performed for the last time in their concert “Time Slip – I.O.I” which was a very emotional moment not only for the girls but also for the band’s fans who cried while singing their latest single “DOWNPOUR” with them.
  • The I.O.I girls have shared one last message via their Twitter account, which reads as follows, “지금까지 YES, I LOVE IT!!! 아이오아이 였습니다!!!! 감사합니다!!!” “Until then, YES, I LOVE IT!!! We have been I.O.I, thank you!!!!”[1].
  • After having finished all their musical activities it has been confirmed that I.O.I will reunite once again for a commercial for the “Elite” uniform line. This is their last activity as a group.  
  • Just on the day of its official dissolution, Inkigayo released the results (via online) of the January 29th broadcast, where I.O.I won with Downpour.
  • After their disbandment, nine of the eleven girls (Somi, Sohye, Chaeyeon, Yeonjung, Nayoung, Pinky, Mina, Doyeon and Chung Ha) had a meeting on the final episode of PRODUCE 101 Season 2 to cheer for the finalists. Yoojung had an individual activity and the girls made video call with her, while Sejeong was busy filming School 2017.
  • At the 2017 MAMA Awards, Chung Ha, Yoojung, Kyulkyung, Nayoung and Doyeon under the name “I.O.I” were the presenters for the “Best New Female Artist 2017” award, including doing the group’s salute and performing part of “Very Very Very”.
  • It was reported that the 11 members will meet at PRODUCE 48 along with WANNA ONE, the two groups filmed on April 22, 2018 and will meet with the trainees at the program to provide support and advice.
  • On April 30, Korean media Ilgan Sport offered the first reports of a possible I.O.I. reunion, and CJ E&M has confirmed that a reunion of the girls is being considered for 2019, but that nothing has been decided. The first rumors surfaced at the end of February, but their agencies denied that there were any negotiations. Two months later, at the end of April, the rumors returned.
    • On June 12, a report came out again that reported a new detail of the possible reunion of I.O.I. This time, they announced that it would be with nine members (without Jeon So Mi and Choi Yoo Jung) and not eleven, as it was reported in April. However, CJ E&M assured that nothing has been decided yet, and everything is still under negotiation.
    • On June 28, it was reported that the group would indeed return with nine members in 2019, and that they have already selected the title song for their comeback and are preparing the choreography. Minutes later CJ E&M announced that they are working on the preparations for the comeback and it would be announced soon. On July 1, 2019, they filmed the “album jacket” of their comeback.
    • According to an exclusive report on September 6, the I.O.I group recently confirmed its return deadline for this December. Experts told the media, “I.O.I’s comeback has been confirmed for December. The decision came after taking into consideration the members’ schedules, the full quality of their comeback songs and other production preparations, etc. A specific date has not been set yet, but it will probably be in early December.”
    • Previously, I.O.I girls were expected to return as a 9-member group in October, However, according to insiders, I.O.I has persisted in contacting Jeon So Mi and Yoo Yeon Jung’s agencies even after previous news reports in hopes of a full 11-member reunion. A source stressed, “The possibility of Jeon So Mi and Choi Yoo Jung participating in the meeting has increased more than before.”
    • Following the PRODUCE 101 vote-rigging controversy, the comeback was cancelled.



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