I.O.I. is the girl group formed by season one of the survival show Produce 101. It was active for seven months in 2016, and left a huge footprint in the kpop community, and helped to pave the way for other survival show groups. It was made up of eleven members, and featured future PRISTIN members Kyulkyung and Nayoung. Notably Roa, Yuha, Eunwoo, and Rena were also all contestants on the show.
