I.O.I

Main Rapper · Lead Dancer · Vocalist

Age

30

Height

171 cm

MBTI

—

Born

Dec 18, 1995

From

Gwanak District, Seoul, South Korea

Blood type

O

Nayoung represented Pledis Entertainment on Produce 101 and finished tenth. She became I.O.I’s leader, then debuted again with PRISTIN and PRISTIN V. Her later work expanded into acting and musical theatre before she returned for I.O.I’s 2026 reunion.

Main Dancer · Lead Vocalist · Rapper

Age

30

Height

161 cm

MBTI

ISTP

Born

Feb 9, 1996

From

Seoul, South Korea

Blood type

A

Chungha finished fourth on Produce 101 and became I.O.I’s main dancer and the choreographer of Whatta Man. Her solo career grew from Hands on Me into the albums Querencia and Bare & Rare, Pt. 1. After joining MORE VISION in 2023, she released Eenie Meenie and the 2025 EP Alivio, then returned for I.O.I’s tenth anniversary in 2026.

Main Vocalist

Age

30

Height

164 cm

MBTI

—

Born

Aug 28, 1996

From

Gimje, North Jeolla, South Korea

Blood type

AB

Sejeong finished second on Produce 101, sang with I.O.I and gugudan, and developed a solo career as a singer-songwriter. Her first studio album Door arrived in 2023 alongside her first solo concert tour. She also led Business Proposal, The Uncanny Counter and Moon River, and joined BH Entertainment in March 2026.

Vocalist · Visual

Age

28

Height

166 cm

MBTI

ISFJ

Born

Dec 1, 1997

From

Suncheon, South Korea

Blood type

A

Chaeyeon had already debuted with DIA before placing seventh on Produce 101 and joining I.O.I. Her screen career began with Drinking Solo and expanded through To. Jenny and Netflix’s My First First Love. After signing with BH Entertainment in 2022, she starred in Family by Choice in 2024 and returned to I.O.I’s reunion activities in 2026.

Lead Dancer · Vocalist · Visual

Age

27

Height

167 cm

MBTI

—

Born

Dec 16, 1998

From

Taizhou, Zhejiang, China

Blood type

O

Kyulkyung trained at Pledis Entertainment and finished sixth on Produce 101. After I.O.I, she joined PRISTIN and PRISTIN V, then developed a solo career in China. She did not participate in I.O.I’s nine-member 2026 reunion promotions.

Vocalist · Rapper

Age

27

Height

163 cm

MBTI

—

Born

Jul 19, 1999

From

Seoul, South Korea

Blood type

A

Sohye entered Produce 101 from an acting agency without a singing or dance background. She finished fifth and became part of I.O.I and its seven-member unit. After the original project ended, film and television acting became central to her career.

Main Vocalist

Age

27

Height

168 cm

MBTI

ESTP

Born

Aug 3, 1999

From

Gwangmyeong, Gyeonggi, South Korea

Blood type

A

Yeonjung represented Starship Entertainment on Produce 101 and secured the eleventh place in I.O.I. She joined WJSN during the project group’s first year. Her later work includes drama soundtracks, a singing-competition victory and musical theatre.

Lead Rapper · Lead Dancer · Lead Vocalist

Age

26

Height

159 cm

MBTI

ISFJ

Born

Nov 12, 1999

From

Guri, South Korea

Blood type

O

Yoojung introduced Produce 101 as the centre of Pick Me, finished third and contributed lyrics to I.O.I’s debut. She later joined Weki Meki and released her solo single album Sunflower in 2022. Following Weki Meki’s August 2024 disbandment, she renewed her Fantagio contract and continued solo screen and music work before I.O.I’s 2026 reunion.

Lead Dancer · Vocalist · Rapper

Age

26

Height

162 cm

MBTI

—

Born

Dec 4, 1999

From

Icheon, South Korea

Blood type

O

Mina represented Jellyfish Entertainment on Produce 101 and finished ninth. She debuted with gugudan during I.O.I’s first year, then moved increasingly into acting. Existing acting commitments kept her out of the group’s 2026 reunion promotions.

Vocalist · Visual

Age

26

Height

173 cm

MBTI

ISTP

Born

Dec 4, 1999

From

Incheon, South Korea

Blood type

O

Doyeon finished eighth on Produce 101 and went on to sing with I.O.I, its Whatta Man unit and Weki Meki. After Weki Meki disbanded in 2024, she renewed her Fantagio contract and continued acting across television, cinema and the stage. Her 2026 work included I.O.I’s reunion and the Cannes premiere of Dora, in which she plays the title character.

Lead Dancer · Lead Vocalist · Rapper · Center · Face of the Group

Age

25

Height

172 cm

MBTI

ENFP

Born

Mar 9, 2001

From

Windsor, Ontario, Canada

Blood type

O

Somi competed on Sixteen before winning Produce 101 as a JYP trainee. The Canadian-born singer became I.O.I’s centre and youngest member. She later signed with THEBLACKLABEL and debuted as a soloist with Birthday in June 2019.