
| Origin | Seoul, South Korea |
| Debut | May 4, 2016 |
| Disbanded | January 29, 2017 |
| Sub Unit | I.O.I Sub-Unit |
| Number of Members | 9 |
| Members | Nayoung Chungha Sejeong Chaeyeon Sohye Yeonjung Yoojung Doyeon Jeon Somi Kyulkyung Mina |
| Oldest Member | Nayoung |
| Youngest Member (Maknae) | Jeon Somi |
| Tallest Member | Doyeon |
| Shortest Member | Yoojung |
I.O.I Former Members Profile
Nayoung

| Full Name | Lim Nayoung |
| Birthday | December 18, 1995 |
| Birthplace | N/A |
| Age | 30 years and 6 months old |
| Height | 5 feet 7 inches (171 cm) |
| Weight | 110 lbs (50 kg) |
| Zodiac Sign | Sagittarius |
| Blood Type | O |
| Education | Dongduk Girls University |
| Position | Leader, Main Rapper, Lead Dancer, Vocalist |
| @nayoung_lim |
Chungha

| Full Name | Kim Chanmi |
| Birthday | February 9, 1996 |
| Birthplace | N/A |
| Age | 30 years and 4 months old |
| Height | 5 feet 3 inches (161 cm) |
| Weight | 97 lbs (44 kg) |
| Zodiac Sign | Aquarius |
| Blood Type | B |
| MBTI | ISFJ |
| Education | Sejong University |
| Position | Main Dancer, Lead Vocalist, Rapper |
| @chungha_official |
Sejeong

| Full Name | Kim Sejeong |
| Birthday | August 28, 1996 |
| Birthplace | Jeonju, South Korea |
| Age | 29 years and 10 months old |
| Height | 5 feet 5 inches (164 cm) |
| Weight | 105 lbs (48 kg) |
| Zodiac Sign | Virgo |
| Blood Type | AB |
| Education | Indeogwon High School |
| Position | Main Vocalist |
| @clean_0828 |
Chaeyeon

| Full Name | Jung Chaeyeon |
| Birthday | December 1, 1997 |
| Birthplace | Jorye-dong, Suncheon-si, Jeollanam-do, South Korea |
| Age | 28 years and 6 months old |
| Height | 5 feet 5 inches (166 cm) |
| Weight | 108 lbs (49 kg) |
| Zodiac Sign | Sagittarius |
| Blood Type | A |
| MBTI | ISFJ |
| Education | School of Performing Arts Seoul |
| Position | Vocalist, Visual |
| @j_chaeyeoni |
Sohye

| Full Name | Kim Sohye |
| Birthday | July 19, 1999 |
| Birthplace | N/A |
| Age | 26 years and 11 months old |
| Height | 5 feet 5 inches (166 cm) |
| Weight | 105 lbs (48 kg) |
| Zodiac Sign | Cancer |
| Blood Type | A |
| Education | Kyunggi Girls’ High School |
| Position | Vocalist, Rapper |
| @s_sohye |
Yeonjung

| Full Name | Yu Yeonjung |
| Birthday | August 3, 1999 |
| Birthplace | Seoul, South Korea |
| Age | 26 years and 10 months old |
| Height | 5 feet 6 inches (168 cm) |
| Weight | 92 lbs (42 kg) |
| Zodiac Sign | Leo |
| Blood Type | A |
| MBTI | ESTP |
| Education | Hanlim Multi Art School |
| Position | Main Vocalist |
| @uyj__0803 |
Yoojung

| Full Name | Choi Yoojung |
| Birthday | November 12, 1999 |
| Birthplace | N/A |
| Age | 26 years and 7 months old |
| Height | 5 feet 2 inches (157 cm) |
| Weight | 97 lbs (44 kg) |
| Zodiac Sign | Scorpio |
| Blood Type | O |
| MBTI | ISFJ |
| Education | Seoul Music High School |
| Position | Lead Rapper, Lead Dancer, Lead Vocalist |
| @dbeoddl__ |
Doyeon

| Full Name | Kim Doyeon |
| Birthday | December 4, 1999 |
| Birthplace | Wonju, Gangwondo, South Korea |
| Age | 26 years and 6 months old |
| Height | 5 feet 8 inches (173 cm) |
| Weight | 110 lbs (50 kg) |
| Zodiac Sign | Sagittarius |
| Blood Type | O |
| MBTI | ISTP-A |
| Position | Vocalist, Visual |
| @lafilledhiver_ |
Jeon Somi

| Full Name | Ennik Somi Douma |
| Birthday | March 9, 2001 |
| Birthplace | N/A |
| Age | 25 years and 3 months old |
| Height | 5 feet 8 inches (172 cm) |
| Weight | 105 lbs (48 kg) |
| Zodiac Sign | Pisces |
| Blood Type | O |
| MBTI | ENFP |
| Education | Seoyun Middle School, Hanlim Multi Arts High School |
| Position | Lead Dancer, Lead Vocalist, Rapper, Face of the Group, Center, Maknae |
| @somsomi0309 |
Kyulkyung

| Full Name | Zhou Jieqiong |
| Birthday | December 16, 1998 |
| Birthplace | Shanghai, China |
| Age | 27 years and 6 months old |
| Height | 5 feet 5 inches (167 cm) |
| Weight | 105 lbs (48 kg) |
| Zodiac Sign | Sagittarius |
| Blood Type | O |
| Education | Shanghai Conservatory of Music; School of Performing Arts Seoul |
| Position | Lead Dancer, Vocalist, Visual |
| @zhou_jieqiong1216 |
Mina

| Full Name | Kang Mina |
| Birthday | December 4, 1999 |
| Birthplace | N/A |
| Age | 26 years and 6 months old |
| Height | 5 feet 4 inches (162 cm) |
| Weight | 92 lbs (42 kg) |
| Zodiac Sign | Sagittarius |
| Blood Type | O |
| Education | Seoul School of Performing Arts |
| Position | Lead Dancer, Vocalist, Rapper |
| @_happiness_o |
Member Ages: Oldest to Youngest
| Member | Birthday | Age |
|---|---|---|
| Nayoung | December 18, 1995 | 30 years, 6 months, 10 days old |
| Chungha | February 9, 1996 | 30 years, 4 months, 19 days old |
| Sejeong | August 28, 1996 | 29 years, 10 months old |
| Chaeyeon | December 1, 1997 | 28 years, 6 months, 27 days old |
| Kyulkyung | December 16, 1998 | 27 years, 6 months, 12 days old |
| Sohye | July 19, 1999 | 26 years, 11 months, 9 days old |
| Yeonjung | August 3, 1999 | 26 years, 10 months, 25 days old |
| Yoojung | November 12, 1999 | 26 years, 7 months, 16 days old |
| Doyeon | December 4, 1999 | 26 years, 6 months, 24 days old |
| Mina | December 4, 1999 | 26 years, 6 months, 24 days old |
| Jeon Somi | March 9, 2001 | 25 years, 3 months, 19 days old |
FAQs
How many members are in I.O.I?
I.O.I is a 9-member K-pop girl group. The group consists of Nayoung, Chungha, Sejeong, Chaeyeon, Sohye, Yeonjung, Yoojung, Doyeon, Jeon Somi, Kyulkyung, and Mina.
When did I.O.I debut?
I.O.I debuted on May 4, 2016.



