ONF (Hangul: 온앤오프; short for On N Off) is a South Korean boy group formed by WM Entertainment in 2017. The group is composed of seven members: Hyojin, E-Tion, J-Us, Wyatt, MK, U, and Laun. ONF debuted on August 3, 2017 with an eponymous mini album.
Prior to joining WM Entertainment, U was a trainee at JYP Entertainment. MK trained at Starship Entertainment. In 2015, MK participated inMnet and Starship Entertainment’s survival program No.Mercy but was eliminated. During the group’s first showcase, Laun revealed that he was a trainee at Big Hit Entertainment and used to train together with BTS.
All of the members made up WM Boys. WM Boys performed as B1A4’s backup dancers at the 2016 Dream Concert in Seoul.
Members J-Us, Laun, and Wyatt made a cameo appearance in labelmate B1A4’s mini drama VCR “The Class”, and E-Tion and Wyatt appeared in another B1A4 VCR called “Feeling”. Hyojin, E-Tion, J-Us, and Wyatt were featured as dancers in the Korean version of the web drama ‘Loss:Time:Life’.
On May 25, 2017, all of the members of WM Boys attended IDOLCON (아이돌콘) and performed “Original”, a B-side track from their unreleased debut album.[unreliable source?]
The group released their debut track “ON/OFF” on August 2, 2017. The following day, the group held their debut stage at M Countdown. The members are composed of two teams, the ON team and the OFF team. Hyojin is the leader of the ON team, which includes E-Tion, MK and Laun. J-Us leads the OFF team, which is Wyatt, and U. Laun is part of both teams.
On November 5, the group joined the survival show Mix Nine and all of them passed the auditions. On October 28, Hyojin was revealed as the male center for Mix Nine’s first performance mission: Just Dance. In the live finale on January 26, 2018, Hyojin placed second and Laun placed seventh. The top nine boys of Mix Nine were set to debut later that year, but due to the inability of the individual companies to form an agreement, the project was cancelled.
On June 7, 2018, ONF released their second EP, You Complete Me, with a total of six tracks including the lead single “Complete”.
On June 15, ONF signed contract with Japanese company Victor Entertainment to make their official debut in Japan in August. They official debuted in Japan on August 1 with their debut single “ON/OFF (Japanese Ver.)”. The music video for their debut single was released on July 3.They also held their Japanese debut showcase at the Tokyo’s Minavi BLITZ Asaka on July 31.
On September 7, ONF released the music video for their second Japanese single “Complete (Japanese Ver.)”. Their full CD, including two Japanese B-sides, was released on September 26.
On February 7, ONF released their third EP, We Must Love, consisting of five tracks with the title track “We Must Love”. They announced a 2019 Asia Tour of the same name, heading to Hong Kong, Singapore, and Taipei in the spring; however, their Singapore stop was cancelled.