f(x) is a South Korean girl group which made their official debut in 2009. Some of their hit songs include Danger, NU ABO and Chu~ etc.
The five members of f(x) are Victoria Song, Amber Liu, Luna Park, Sulli Choi and Krystal Jung. .
Dubbed as the Asia Pop Dance Group, f(x) made their official debut in September 2009 with digital single LA chA TA, followed by their first single album Chu~♡ in November. The girls released their first mini album NU ABO in May 2010. They released their first full length album, Pinocchio, in April 2011.