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온앤오프

Boy group · KI Entertainment · since 2017

ONF

온앤오프

Split into an ON team and an OFF team at debut, ONF waited until 2025 for a win on public TV. Wyatt dropped to his knees on the Music Bank stage.

10years on 3 August 2027 · in 283 days

Their story

Two teams in one

ONF is short for On and Off, and the idea was built into the line-up. At the 2017 debut Hyojin led the ON team with E-Tion and MK, now Minkyun, while J-Us, now Seungjun, led the OFF team with Wyatt and U. Laun belonged to both. Hyojin and Laun had just been through Mix Nine, an audition show whose planned winners' debut never happened. Laun left two years later, and the six who remained have stayed together since.

Second place, then a first

The turn came on Mnet's Road to Kingdom in 2020, where ONF finished second. Their first studio album followed, and its lead single "Beautiful Beautiful" brought their first music show win. Then the five Korean members enlisted within a week of each other at the end of 2021 and came out again within a week of each other in June 2023. U, who is Japanese, did not have to serve.

A long-time writer

Writer Hwang Hyun has worked with ONF since the debut and was still part of the team on their 2026 album. The members themselves, though, now do much of the work. On ONF: My Self, Wyatt and Minkyun co-wrote songs and lyrics, Yuto directed the performance and Seungjun helped plan the album. Hyojin called it the most honest picture of ONF's present.

Where they are now

Their biggest night on TV came in February 2025, when "The Stranger" won on Music Bank and Wyatt fell to his knees on stage. A year later the contracts with WM Entertainment ended after eight years. The six kept the name ONF and signed with KI Entertainment in March 2026, when U also became Yuto. In June the rock-based "Open the Door" led ONF: My Self, part two of their second studio album.

Timeline

  1. Debut stage on M Countdown with the EP On/Off.

  2. Second place on Mnet's Road to Kingdom.

  3. First music show win, on The Show with "Beautiful Beautiful".

  4. "The Stranger" wins on Music Bank, their first win on a public broadcaster.

  5. The WM Entertainment contracts end; the six keep the name ONF.

  6. ONF: My Self, part two of the album, with "Open the Door".

  7. 24 October 2026

Start with these 5 songs

  1. We Must LoveTitle track of the 2019 EP of the same name.2019
  2. Beautiful BeautifulThe song behind their first music show win, in 2021.2021
  3. Love EffectThe comeback after all five Korean members came back from the military.2023
  4. The StrangerThe song that finally won on Music Bank.2025
  5. Open the DoorA rock-based title track and their first single at KI Entertainment.2026

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In the Fan Chart

The Fan Chart on The Crowd adds up every fan's top 10. Here is where ONF stands.

    Add ONF to your setlist

    For FUSE

    Hyojin

    김효진
    Name
    Kim Hyo-jin
    Born
    22 April 1994

    Led the ON team at debut and finished second on Mix Nine.

    E-Tion

    이창윤
    Name
    Lee Chang-yoon
    Born
    24 December 1994

    Part of the ON team; he enlisted on the same day as Hyojin, 28 December 2021.

    Seungjun

    이승준
    Name
    Lee Seung-jun
    Born
    13 January 1995

    Led the OFF team as J-Us and has used his own name since 2024; he planned ONF: My Self.

    Wyatt

    심재영
    Name
    Shim Jae-young
    Born
    23 January 1995

    Part of the OFF team; co-wrote songs and lyrics on ONF: My Self.

    Minkyun

    박민균
    Name
    Park Min-kyun
    Born
    16 November 1995

    Debuted as MK and switched to his own name in 2024; co-wrote songs on ONF: My Self.

    YutoYoungest member

    유토
    Name
    Mizuguchi Yuto
    Born
    16 March 1999

    The Japanese member, known as U until 2026; performance director for ONF: My Self.

    Quick answers

    When did ONF debut?

    On 3 August 2017 on M Countdown, with the EP On/Off. The title song came out a day earlier.

    How many members does ONF have?

    Six: Hyojin, E-Tion, Seungjun, Wyatt, Minkyun and Yuto. Laun left in August 2019.

    What is the ONF fandom called?

    FUSE (퓨즈).

    What does ONF stand for?

    On and Off, written 온앤오프 in Korean. At debut the group was split into an ON team led by Hyojin and an OFF team led by Seungjun.

    Is ONF still active?

    Yes. Their contracts with WM Entertainment ended on 29 January 2026, but all six kept the name, signed with KI Entertainment in March and released ONF: My Self in June.

    Know your ONF?Six K-pop questions a day in the Daily, and a collectible card for every finished set.

    Play the Daily

    Last checked 24 October 2026. Sources include Korea JoongAng Daily, Soompi, Sports Kyunghyang and Star News. Spotted a mistake? Tell us.