Amber Liu's show of strength: The K-pop star goes solo, with designs on U.S. stardom - Los Angeles Times
K-pop Group f(x) Member Sulli Departs from All Her Showbiz Activities, Why?
f(x) to turn on the 'Red Light' for their promotions with sudden inactivity?
f(x) - Rum Pum Pum Pum / BYU KPOP CLUB taught by Tessa
f(x) (musical group) - Wikipedia
14 December 2014 - Seoul, South Korea : South Korean K-Pop girl group T-ara, performs onstage during the 2nd T-ara Asia fan club meeting at Sangmyung University Art Center in Seoul, South
⭐F(x) comeback concept♧♤♥♢
K-Pop's Dark Side: Assault, Prostitution, Suicide, and Spycams - Bloomberg
f(x) (musical group) - Wikipedia