Yu Yeon-jung (Hangul: 유연정), better known as Yeonjung (연정), was born on August 3, 1999 (age 20) in Gwangmyung, Gyeonggi Province, South Korea. She is the former member of I.O.I. and is the main vocalist, centre and maknae of the South Korean-Chinese girl group Cosmic Girls. She joined Cosmic Girls as the 13th member in July 2016.


Yeonjung is a former SM Entertainment trainee. Since she started training at a young age, she often missed out on things with school.

In 2015, she appeared on the Mnet survival show Produce 101 representing Starship Entertainment where she ranked 11th place, making her a member of the temporary group I.O.I as of May 2016.

In July 2016, it was revealed that she would be joining the group Cosmic Girls, as well as being a member of its Natural Unit and representing the zodiac sign Ophiuchus. She debuted in the group as a main vocalist on August 17, 2016 with the release of the group's second mini-album The Secret.

She attended Hanlim Multi Art School until she graduated on February 10, 2018.



Title Year Peak Chart
Sales (DL) Album


"I Will Be On Your Side" (내가 니편이 되어줄게)
(with Yu Seung-woo)
2016 KOR: 23,352+[4] Non-album singles
"#Drive" (#드라이브)
(DinDin featuring Yeonjung)
2017 N/A
"Marry You"
(with Maktub)
92 KOR: 22,890+[5]
"—" denotes that it did not chart or was not released in that region


Title Year Album
"Fire & Ice"
with Dawon
2016 The Snow Queen 3: Fire and Ice OST
"You're Dazzling" (눈부신 그대) 2017 Queen for Seven Days OST
"Toy" (서툰 고백)
with Brother Su
Love Playlist OST
"Meloholic" (멜로홀릭) Meloholic OST
"Your Name Is..." (너의 이름을…) 2018 The Undateables OST
"Stay With You" Where the Stars Land OST[6]


Televison ShowsEdit

Year Title Role Network Notes
2017 A Korean Odyssey Lee Da-in Tvn Cameo (Episode 1)[citation needed]

Variety ShowsEdit

Year Title Network Notes
2016 Produce 101 Mnet Survival show that determined I.O.I members
Placed eleventh
2018 Urban Legends KBS with Soobin, Yeoreum and Dayoung[7]

Official LinksEdit


  1. 1.0 1.1 1.2 Profiles on the Official Website.
  2. Dream Your Dream φορεύς Unit teaser.
  3. Gaon Digital Chart Gaon Music Chart. Retrieved August 31, 2018.
  4. Gaon Music Chart (2016년 46주차 Download Chart) Retrieved August 31, 2018.
  5. Gaon Music Chart (2017년 50주차 Download Chart Gaon Music Chart. Retrieved August 31, 2018.
  6. Yeonjung Playlist 2. Retrieved November 23, 2018.
  7. WJSN joining "Urban Legends"... The Birth of Entertainment? Naver (in Korean). Retrieved September 30, 2018.
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