ONF (pronounced as On and Off, Korean: 온앤오프) is a South Korean boy group formed and managed by WM Entertainment. Originally debuting as a seven-piece group on August 3, 2017 with their EP, the group currently composed of six members: Hyojin, E-Tion, J-Us, Wyatt, MK and U. One of the members Laun, left the group on August 23, 2019 for personal circumstances shortly before the group's fourth extended play Go Live. Since their debut, ONF has since released a studio album, a repackaged album, seven extended plays, and two Japanese singles following their Japanese debut on August 1, 2018.