Amber Liu is a South Korean-American singer. Liu participated in SM Entertainment's 2008 global auditions, leading to training in Korea and her debut as one fifth of the girl group f(x) in 2009. She has since released the album Z! and the extended plays The 1st Mini Album Beautiful and X; her popular songs include SHAKE THAT BRASS, I Just Wanna, and On My Own. Liu also appeared in the film Eagle and the Albatross.