- published: 26 Oct 2015
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f(x) ( /ˌɛf ˈɛks/; Korean: 에프엑스) is a five member South Korean girl group formed by SM Entertainment in 2009. The name is a play on the mathematical notation for function, and when input with different 'x', there can be many different outcomes. The f stands for flower and the x represents the female's double x chromosome. f(x) strives to be the kind of girl group that can change and adapt to many situations. The group members have also been nicknamed "function girls". The group made their debut on September 1, 2009 with release of a digital single "La Cha Ta" (stylized as "LA chA TA"). The quintet consists of Victoria, Amber, Luna, Sulli and Krystal.
Krystal Jung was first spotted by SM Entertainment in 2000 on a family visit to Korea, which earned her a small role in a short segment of Shinhwa's "Wedding March" music video. Sulli Choi first debuted as a child actress in 2005 when she was selected to play young Princess Sun-hwa in the SBS television drama, The Ballad of Seo-dong. In 2006, SM Entertainment recruited Luna after seeing her performing on SBS's television program, "Truth Game".Victoria was spotted by a S.M. Entertainment's agent at a Beijing dance competition, and later joined the company. Two months later, Amber was cast through SM's Global Auditions in Los Angeles, California, where she was one of two people (one male) selected to be trainees.