f(x) is a mathematic symbol and when you input different "x" you can let different outcomes. So as f(x), we want to be the kind of group that can change and adapt to many situations. - Krystal
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f(x) (에프엑스)
Fanfictionf(x) is a multi-national K-POP girl group formed by S.M. Entertainment in 2009. The group comprises of four members: Victoria, Amber, Luna and Krystal. Ex-member - Sulli. (Currently an actress) This book contains of f(x)'s quotes, facts and song lyr...
