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I.O.IMain Vocalist

Yeonjung

연정Yoo Yeon-jung (유연정)

I.O.I and WJSN vocalist Yeonjung won the singing competition V-1 and later made her musical-theatre debut in Lizzie.

Yeonjung of I.O.I — official I.O.I: LOOP concept photograph, 2026
Source: I.O.I / Swing Entertainment
Age
27
Aug 3, 1999
Height
168 cm
5′6″
MBTI
ESTP
self-reported
Debut
2016
with I.O.I

At a glance

Profile

Stage name
Yeonjung (연정)
Birth name
Yoo Yeon-jung (유연정)
Position
Main Vocalist
Birthday
August 3, 1999 (age 27)
Zodiac sign
Leo
Chinese zodiac
Rabbit
Height
168 cm (5′6″)
Blood type
A
MBTI
ESTP
Nationality
South Korean
Birthplace
Gwangmyeong, Gyeonggi, South Korea
Nicknames
Cider Vocal
Joined
May 4, 2016

10 facts

About Yeonjung

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.

  1. 01

    She became WJSN’s thirteenth member in 2016.

  2. 02

    Her first WJSN comeback was the EP The Secret in August 2016.

  3. 03

    She collaborated with Yoo Seung-woo on I Will Be On Your Side.

  4. 04

    She and Dawon recorded Fire & Ice for The Snow Queen 3 soundtrack.

  5. 05

    She entered Dankook University’s musical-theatre programme.

  6. 06

    She won V-1 in 2019, defeating Dreamcatcher’s Siyeon in the final.

  7. 07

    Her soundtrack work includes Queen for Seven Days, Where Stars Land and Melting Me Softly.

  8. 08

    She made her musical-theatre debut in Lizzie in 2022.

  9. 09

    She also played Seo Dan in the stage adaptation of Crash Landing on You.

  10. 10

    She co-wrote and co-composed IF I for the 2026 reunion EP I.O.I: Loop.

10 other members

Also in I.O.I

Full group profile