'' f(x)'' is a South Korean girl group formed by

SM Entertainment SM Entertainment Co., Ltd. () is a South Korean multinational entertainment agency. It is one of South Korea's largest entertainment companies where it was established in 1995 by record executive and record producer Lee Soo-man. The company ha ...

in 2009. Their debut "''LA chA TA''" was released on September 1. They also released their first physical single, " Chu~♡", on November 9. On May 14, 2010, the group released their first EP, ''

NU ABO ''Nu ABO'' ( ko, Nu 예삐오; ''Nu Yeppioh'') is the debut extended play by South Korean girl group f(x). It was released on May 4, 2010, in South Korea under the record label of SM Entertainment and distribution label of KMP Holdings. The ext ...

'' with the title track as the lead single. They promoted the single "Mr Boogie" as a follow-up single from their EP. They released their first full-length studio album ''

Pinocchio Pinocchio ( , ) is a fictional character and the protagonist of the children's novel '' The Adventures of Pinocchio'' (1883) by Italian writer Carlo Collodi of Florence, Tuscany. Pinocchio was carved by a woodcarver named Geppetto in a Tuscan ...

'' in April 2011 with the title track as the lead single. In June 2011 ''Pinocchio'' was re-released under the title "Hot Summer" with three previously released digital singles and the title track as the lead single. The group released their second EP '' Electric Shock'' on June 10, 2012. On July 29, 2013 the group released their second full-length studio album ''

Pink Tape ''Pink Tape'' is the second studio album by South Korean girl group f(x). The album was released on July 29, 2013, by S.M. Entertainment. ''Pink Tape'' is the first studio album by f(x) in over two years, the last being the repackage of their fi ...

'' with the lead single "Rum Pum Pum Pum". The group released their third full-length studio album '' Red Light'', on July 7, 2014. In August 2015, 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, ''

4 Walls ''4 Walls'' is the fourth studio album by South Korea-based girl group f(x), released by SM Entertainment and Genie Music on October 27, 2015. A dominant electropop and synthpop record that incorporates various genres, such as house, EDM and UK ...

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