• I. Introduction

    F(x) was a 5 members girl group formed by SM Entertainment.

    The group was composed of Krystal, Victoria, Amber, Luna and Sulli until her departure from the group in August 2015.

    f(x) is a function of mathematics, which means that they would carry out various activities, based on the various talents and attractiveness of the members, like the formula whose results change depending on the value of x. In addition, "f" symbolizes flower and "x" symbolizes 'X' on the female chromosome XX which, taken together, symbolizes "flower reminiscent of womenF(x) official debuted on September 5, 2009 with the release of the digital single "La Cha Ta".

    Known for their experimental style and eclectic , electropop based sound, F(x) is one of the first few recognized K-pop groups internationally, becoming the first K-pop act to perform at SXSW.

    In 2017, Billboard ranked f(x) at number seven on their "Top 10 K-pop Girl Groups of the Past Decade" list.
    The group received the title of "Asian Pop Dance Group" by their label and are touted as a multinational group since f(x) consists of members from China, United States and South Korea.

    The group has presumably disbanded following the departures of three members in 2019.

    II. Career: Predebut

    Krystal was scouted by SM Entertainment in 2000 while on a family visit to Korea, along with her sister Jessica.

    She subsequently appeared in a small role in Shinhwa Music Video for ''Wedding March''.

    Sulli was a child actress making her first television appearance in 2005 as the young Princess Seonhwa of Silla in Ballad of Seodong. Luna was recruited by SM following her 2006 appearance on the reality television program Truth Game. Victoria was scouted through a Beijing dance competition in September 2007 after winning first place. In 2008 Amber was cast through S.M. Global Auditions in Los Angeles.

    2009-10: Debut and Nu ABO

    F(x) was first introduced as a five-member dance-focused pop group in a teaser clip released on August 24, 2009. Their debut single "LA chA TA" was released on September 1, with a showcase held the following day at Samseong Fashion Center in Gangnam.

    Shortly after their debut, f(x) featured in promotions of the LG Chocolate cellphone alongside SNSD. Both groups released versions of the song "Chocolate Love"; f(x)'s being an electropop version released on October 8. They also released their first physical single, "Chu~♡", on November 9.

    At the start of 2010, f(x) collaborated with the Chinese boy band M.I.C to promote the LG Cyon cellphone, releasing a chinese cover of Lollipop.

    In April they appeared in their documentary reality programme, Hello f(x). On May 4, the group released their first extended play, Nu ABO. The lead single "Nu ABO" was a commercial success in Korea and become a number one single on the Gaon Chart.
    In June, Amber went on hiatus due to an ankle injury, while the remaining members continued group activities without her for the remainder of the year. They promoted the single "Mr Boogie" as a follow-up single from their EP and participated in the SMTown Live 10 World Tour, as well as filming their second documentary reality show, f(x)'s Koala. Towards the end of 2010 it was announced that f(x)'s albums would be distributed under Japanese label Avex Entertainment in Japan, Taiwan, China, and Hong Kong. Amber returned to the group in early 2011.

    2011-2012: Pinocchio, Hot Summer and Electric Shock

    F(x) released their first full-length studio album Pinocchio in April 2011, with the lead single Pinocchio (Danger). On June 14, Pinocchio was re-released under the title Hot Summer.

    The repackaged album contained the title track Hot Summer as well as three previously released digital singles: "LA chA TA", "Chu~♡", and Is It Ok?

    The group released their second EP Electric Shock on June 10, 2012. It was met with critical acclaim and they achieved nine music show wins with the title track Electric Shock.

    In November, the group won the 'Best Dance Performance - Female Group' award for "Electric Shock" at the 2012 MAMA Awards in Hong Kong.

    In January 2013, two songs from the EP, "Electric Shock" and "Jet", were nominated for 'Best Dance and Electronic Song' at the 10th Annual Korean Music Awards with "Electric Shock" going on to win the award.

    2013-14: Pink Tape and Red Light

    On July 29, the group released their second full-length album Pink Tape with the lead single "Rum Pum Pum Pum".

    On July 7, they released their third studio album Red Light with the electronic house title track of the same name.

    Shortly after the album was released, it was announced that Sulli was unable to perform with the group for health reasons, and that she would be taking a temporary hiatus.

    2015-16: Sulli's departure, 4Walls, first concert tour and hiatus

    On July 22, 2015, f(x) released a Japanese physical single album Summer Special Pinocchio/Hot Summer.

    In August, it was announced that Sulli had officially left the group to focus on acting.

    The remaining four members continued as a group, releasing their fourth studio album 4Walls in October. To promote the album's release, the group starred in a web reality program titled f(x)=1cm.

    In January 2016 the group won the Disk Bonsang award at the 2016 Golden Disk Awards and commenced their first concert tour, Dimension 4 - Docking Station in Seoul which continued with six concerts in Japan in February.

    On January 31, they announced their official fan club name, MeU.

    On July 22, 2016, f(x) released a new single All Mine through the SM Station project.

    On November 2, 2016, f(x) released their second Japanese physical single album 4Walls/Cowboy,

    including a Japanese version of "4 Walls", along with a new song titled "Cowboy", which was performed live on the same day at the group's encore concert in Yokohama.

    From 2016, f(x) halted group promotions and the members have embarked on individual music, acting, and modelling careers.

    2019-2021: Reunion and Departures from SM

    In an interview with Krystal on January 19, 2018, she stated that the members frequently discussed making a comeback but timing never worked out.

    In August 2019, f(x) officially reunited and performed together at the three-night SM Town Live in 2019 in Tokyo concert as a three-piece (without Victoria).

    On September 1, Amber announced via her social media accounts that she had not renewed her contract with SM Entertainment.

    On September 5, SM Entertainment shared that Luna had also not renewed her contract with the company; Victoria also announced her departure from SM on her Instagram, but SM instead reported that Victoria's contract with them was still under discussion.

    In an interview with Amber on October 1, she stated that f(x) had no plans to reunite, stating "Whether we do music or not, I think there will be a time when we can but I think right now we’re just figuring ourselves out. We have no plans, but it’s never not an option.

    In October 2020, it was announced that Krystal officially left SM, and had signed an exclusive contract with H& Entertainment.

    In April 2021, SM announced Victoria's contract had expired.

    III. Discography


    Studio Albums

    Pinocchio 2011
    Hot Summer (repackage)
    Pink Tape
    Red Light
    4Walls 2015

    Mini Albums

    Nu ABO
    Electric Shock



    Digital Singles

    La Cha Ta
    12:25 (Wish List)
    All mine



    Summer Special Pinocchio/Hot Summer
    4Walls/Cowboy 2016

    Digital Single

    Hot Summer

    IV. MVS