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CompanyWM Entertainment
Year Debut2017
Year Active7
Year DisbandedN/A

Not Ranked


ONF (온앤 오프; acronym for On N Off) is a six-member South Korean and Japanese boy group formed by WM Entertainment. The group debuted on August 3, 2017 with originally seven members: Hyojin, J-US, E-Tion, Wyatt, MK, U, and Laun (left in 2019).

The name ONF means On N Off. It is pronounced ‘on and off’. The official fandom name of ONF is Fuse, which is an electrical reference to their name’s meaning, like a switch. It is also meant to combine the words ‘ONF’ and ‘muse’ to show their connection to their fans.

ONF Member Ages

ONF Age Ranking

Ranked from oldest to youngest.

1. HyojinApr 22, 199429 years old
2. E-TionDec 24, 199429 years old
3. J-USJan 13, 199529 years old
4. WyattJan 23, 199529 years old
5. MKNov 16, 199528 years old
6. UMar 16, 199925 years old

ONF Member Heights

ONF Height Ranking

Ranked from tallest to shortest.

1. MK1.78 m (5'10")
2. Wyatt1.75 m (5'9")
3. J-US1.74 m (5'9")
4. E-Tion1.73 m (5'8")
5. Hyojin1.73 m (5'8")
6. U1.70 m (5'7")

Members and Position(s)


ONF is composed of six members born between 1994 and 1999. Their names are: Hyojin, J-US, E-Tion, Wyatt, MK, and U. The oldest member is Hyojin (born Apr 22, 1994). The youngest member (maknae) is U (born Mar 16, 1999).


HyojinON leader, main vocalist
E-Tionlead vocalist
J-USOFF lead dancer, vocalist, rapper
Wyattmain rapper, main dancer, vocalist
MKlead vocalist, rapper
Umain dancer, lead rapper, maknae

Fun Facts and Trivia

  • The oldest member of ONF is Kim Hyojin (born Apr 22, 1994).
  • The youngest member (maknae) of ONF is Mizuguchi Yuto, better known as U (born Mar 16, 1999).
  • The tallest member of ONF is MK with a height of 178 cm (5'10'').
  • The shortest member of ONF is U with a height of 170 cm (5'7'').


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