f(x) debuted in 2009 under the SM Entertainment label. That same year, After School, 2NE1, and BEAST (B2ST) also were introduced to Kpop fans. f(x) has five members: Song Qian (Victoria), Amber Josephine Liu (Amber), Park Sun Young (Luna), Choi Jin Ri (Sulli) and Jung Soo Jung (Krystal). The group is known for its international membership — Victoria is from China, while Amber and Krystal hail from the United States. . . . Click here to continue reading on KPOPIANA.