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Girl group · SM Entertainment · since 2009

f(x)

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An electropop sound that set them apart at SM, and no new group release since "All Mine" in 2016. f(x) were never officially disbanded, but all four members now work separately.

18years on 5 September 2027 · in 318 days

Quick answers

When did f(x) debut?

On 5 September 2009, on MBC's Show! Music Core, with the digital single "La Cha Ta", released on 1 September.

How many members does f(x) have?

Four: Victoria (leader), Amber, Luna and Krystal. Sulli was a member from 2009 to 2015; she died in October 2019.

What is the f(x) fandom called?

MeU. The group announced the name at their first solo concert, in Seoul in January 2016.

What does f(x) mean?

It is the symbol for a mathematical function. SM founder Lee Soo-man chose it so that students learning functions around the world would think of the group.

Is f(x) still active?

No new group music has come out since "All Mine" in 2016. All four members left SM between 2019 and 2021, but SM never announced a disbandment.

The story so far

  1. Debut on Show! Music Core with the digital single "La Cha Ta".

  2. First physical single, Chu~♡.

  3. First EP, Nu ABO.

  4. First studio album, Pinocchio, led by "Pinocchio (Danger)".

  5. EP Electric Shock. The title track wins Best Dance & Electronic Song at the 2013 Korean Music Awards.

  6. Perform at K-Pop Night Out at SXSW in Austin, Texas.

  7. Pink Tape debuts at No. 1 on Billboard's World Albums chart; "Rum Pum Pum Pum" tops the K-Pop Hot 100.

  8. Sulli leaves to focus on acting. As four, f(x) release 4 Walls in October.

  9. First solo concert, Dimension 4 - Docking Station, in Seoul. The fandom name MeU is announced.

  10. The members' SM contracts end: Amber and Luna in 2019, Krystal in 2020, Victoria in 2021. No disbandment is announced.

Start with these 5 songs

  1. Pinocchio (Danger)Lead single of Pinocchio, their first studio album.2011
  2. Hot SummerTitle track of the Pinocchio repackage.2011
  3. Electric ShockBest Dance & Electronic Song at the 2013 Korean Music Awards.2012
  4. Rum Pum Pum PumTheir first No. 1 on Billboard's K-Pop Hot 100.2013
  5. 4 WallsTitle track of their fourth and latest album.2015

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In the Fan Chart

The Fan Chart on The Crowd adds up every fan's top 10. Here is where f(x) stands.

    Add f(x) to your setlist

    For MeU

    Victoria

    빅토리아
    Name
    Song Qian
    Born
    2 February 1987
    Role
    Leader

    Began acting in China in 2012 with When Love Walked In and works there since.

    Amber

    엠버
    Name
    Amber Josephine Liu
    Born
    18 September 1992

    The first f(x) member to release a solo album: the EP Beautiful, February 2015.

    Luna

    박선영
    Name
    Park Sun-young
    Born
    12 August 1993

    Made her Broadway debut in 2022 as MwE in the musical KPOP.

    Krystal

    정수정
    Name
    Jung Soo-jung
    Born
    24 October 1994
    Role
    Youngest member

    Played Jeon Yi-kyung in the 2026 tvN drama How to Become a Building Owner in Korea.

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

    Play the Daily

    Last checked 21 October 2026. Sources include Billboard, The Korea Times, Sports Kyunghyang and NME. Spotted a mistake? Tell us.