ONF is a South Korean - Japanese boy band formed and managed by WM Entertainment. Originally debuting as a seven-piece group on August 3, 2017, with their EP, the group currently consists of six members: Hyojin, E-Tion, Seungjun, Wyatt, Minkyun and U. The group's youngest member, Laun, left the group on August 23, 2019, for personal circumstances shortly before the group's fourth extended play Go Live.