Hangul: 온앤오프

Alternative name: オンエンオフ

Fandom Name: Fuse

Origin: South Korea

Debut Date: Korea: August 02, 2017 - Japan: August 01, 2018

ONF Members

About ONF

ONF Member Ages

Ranked from oldest to youngest.

1. HyojinApr 22, 199428 years old
2. E-TionDec 24, 199428 years old
3. J-USJan 13, 199528 years old
4. WyattJan 23, 199528 years old
5. MKNov 16, 199527 years old
6. UMar 16, 199924 years old

ONF Member Heights

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”).


  • MK was an apprentice at Starship Entertainment, and participated in Mnet’s survival show NO.MERCY, but was eliminated in episode 7.
  • They performed for the first time at the idolCON event organized by Mnet where a large number of groups (31 in total). Part of these were groups that have not made their official debut.
  • Laun explained that the group consists with two units, (ON) has an upbeat image with emotional vocals as its key point, and (OFF) has a charismatic image and focuses on a power-packed dance performance.
  • On September 30, it was revealed that the group will participate in YG’s survival program, MIXNINE.
  • Laun and Hyo Jin were finalists, so they were going to debut in the winning group of MIXNINE but some problems occurred regarding that and they could not debut together with the A.C.E guys and other guys who had not debuted yet.
  • They will debut in Japan in summer 2018.
  • During the “Complete” promotions they reached Hanteo rank 3.



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