Real name: 최유정 (Choi Yoo Jung)

Effective period / Period of releases: 2022

Choi Yoo-jung (born November 12, 1999), better known by the mononym Yoojung, is a South Korean singer and songwriter signed under Fantagio. She debuted as a member of I.O.I in May 2016 after achieving third place in the 2016 survival program Produce 101. In January 2017, I.O.I officially disbanded after eleven months of promotion. Following disbandment, she returned to her respective agency and eventually debuted with Weki Meki in August 2017.