f(x) was a four member (originally five member) South Korean girl group formed by SM Entertainment active from 2009 to 2016. The name is a play on the mathematical notation for function, with "f" signifying "flower" and "x" representing the female's double X chromosome. The group made their debut on September 1, 2009 with release of a digital single "
라차타 (LA chA TA)". The quartet consists of
宋茜 (Victoria),
엠버 (
Amber),
루나 (
Luna), and
크리스탈 (Krystal). Krystal was first spotted by SM Entertainment in 2000, which earned her a small role in a …
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