I.O.I (Korean: 아이오아이) was a Korean girl group, formed by the survival show “Produce 101”. The group consisted of 11 members: Somi, Sejeong, Yoojung, Chungha, Sohye, Kyulkyung, Chaeyeon, Doyeon, Mina, Nayoung, Yeonjung. I.O.I debuted on May 4, 2016, under YMC Entertainment and CJ E&M. The group officially disbanded on January 29th, 2017.