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f(x) promoting 4 Walls (2015)
Left to Right: Amber, Luna, Victoria, Krystal

f(x) (에프엑스; pronounced "Effects") is a Korean pop girl group created by SM Entertainment. The group has been given the title of "Asia Pop Dance Group" by their label and are touted as a multinational group since f(x) consists of members from China, the United States, and South Korea. In 2012 it was announced that they would debut in Japan under avex.



  • Victoria (Leader, Vocals, Main Dancer)
  • Amber (Main Rapper, Sub Vocals)
  • Luna (Main Vocals, Lead Dancer)
  • Krystal (Lead Vocals, Visual, Maknae)

Former Members

  • Sulli (Vocals, Lead Rapper, Visual)



SM Entertainment revealed the teaser music video for "LA chA TA", f(x)’s debut digital single, on September 23, 2009 at their home page website and their official Youtube account. Described as a "girl group with a concept that has never been done before with a dynamic feel", the group was announced to debut in fall 2009 with a goal not only for domestic activity in Korea, but for overseas ventures. The sudden announcement of SM Entertainment’s new girl group generated huge buzz in the news. Krystal, the lead vocalist, gained early popularity due to being the younger sister of Girls' Generation’s main vocalist Jessica.

f(x) promoting "LA chA TA" (2009)

Profile pictures of each member were released on August 25, 2009 with the explanation of their name "f(x)". SM Entertainment stated "The 'x' in f(x) is a variable, and if it changes, the result will be different. The 'f' stands for 'flower', and the 'x' stands for the female chromosome 'xx'. And like a flower, they will blossom and become hot icons to represent Asia as the top "Asian Pop Dance Group"."

They released "LA chA TA" on August 31, 2009 then held a debut showcase on September 2, 2009 where they debuted their live performance for the song and unveiled the music video. Sunny from Girls' Generation and Leeteuk from Super Junior were MC's for he event while the groups Girls' Generation and SHINee attended for support. The guest list was limited to 150 attendees chosen from the Internet and the showcase was an hour long.


The music video for "LA chA TA" was released on September 3, 2009. According to SM Entertainment, "LA chA TA" is a coined term of exclamation and onomatopoeia, that was inserted to heighten and dramatize the excitement of the fun song. With its easy pronunciation, the word is expected to make sensation along with the music". They made their official debut with the song at Music Core on September 5, 2009.

After promotions for "LA chA TA" ended, f(x) teamed up with Girls' Generation and released "Chocolate Love", a digital single that consisted of two versions: Girls' Generation's "Retro Pop" version and f(x)'s "Electronic Pop" version. Produced by Bloodshy & Avant, the single was used to promote the LG Cyon "Chocolate" phone. The songs were released on October 8, 2009 and the music video for f(x)'s version of "Chocolate Love" was revealed on October 15, 2009. Girls' Generation and f(x) participated in a "Chocolate Love" showcase, which aired on "GomTv".

f(x) promoting NU ABO (2010)
f(x) returned with their debut single "Chu~♡". The title track was digitally released on November 4, 2009. The music video and their debut performance for the song was revealed on November 6, 2009. They debuted the live performance of the song at Music Bank where they danced the choreography created by Rino Nakasone.

On December 26, 2009 it was announced that f(x) would collaborate with Chinese boy band M.I.C to release "Lollipop", the Chinese version of 2NE1 and BIGBANG's "Lollipop". The song was used for Chinese promotions of the LG Cyon phone, and it was released on January 3, 2009. The CF was released on January 10, 2010 and the music video was revealed on January 12, 2010.

1st Mini-Album

f(x) obtained their own reality program titled Hello f(x) broadcast on Y-Star. The show premiered on April 3, 2010, and consisted of four episodes chronicling the group's return. Teaser photo's of Amber and Sulli were released online on April 27th, while the easer photo's of Luna, Krystal, and Amber were revealed on the 28th. Their debut mini-album titled NU ABO was scheduled to be released on May 4, 2010. The teaser music video for "NU ABO", the title track and lead single, was released online on April 29th.


Korean Discography

f(x) promoting PINOCCHIO (2011)
f(x) promoting Electric Shock (2012)
f(x) promoting Pink Tape (2013)
f(x) promoting Red Light (2014)




Digital Singles

Soundtracks/ Other

Chinese Discography

Digital Singles

Japanese Discography


Digital Singles

Video Releases





TV Shows

Pinocchio (Danger)
Hot Summer
Electric Shock
Cheot Sarangni (Rum Pum Pum Pum)
Red Light
4 Walls

External Links

Personal tools