f(x): The Perfect Formula

f(x)

f(x)

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.