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/Amber Liu), 루나 (Luna), and 크리스탈 (Krystal).
These are photos from concerts where f(x) played, so they may be of other bands that played the concert as well.
KCON Jun 2, 2016 Paris, Île-de-France, France Uploaded by Greatgadsby97
