Amber Liu (born September 18, 1992) is an American singer, rapper, songwriter. She debuted as a member of the South Korean girl group f(x) in September 2009. In 2015, Amber became the first f(x) member to make a solo debut with the release of her first extended play Beautiful and has since further released solo singles. In 2018, Amber signed with Steel Wool Entertainment and United Talent Agency to represent her US and worldwide activities, respectively, and left SM Entertainment the following year.