Choi Yoo-jung (born November 12, 1999), known mononymously as Yoojung, is a South Korean singer, dancer, rapper and actress signed under Fantagio. She debuted as 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.