Amber Josephine Liu (born September 18, 1992), known professionally as Amber or Amber Liu, is an American singer, rapper, and songwriter. She debuted as a member of the South Korean girl group f(x) in September 2009. In 2015, she 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 July 2018, Liu joined Steel Wool Entertainment following her Korean label SM Entertainment joint partnership with Steel Wool to manage her US activities. She later released the maxi singles "White Noise + Lost At Sea'" in September 2018 and "Countdown + Beautiful" in November 2018. In September 2019, she left SM Entertainment and exclusively signed with Steel Wool Entertainment prior to the release of her 2020 extended play X.
Liu was born on September 18, 1992, in Los Angeles, California. Her parents are from Taiwan and her father has Teochew ancestry. She has one older sister named Jackie. She attended El Camino Real High School in Los Angeles. Liu was cast from SM Entertainment's Los Angeles global audition in 2008, where she and one male were selected to be trainees for SM Entertainment. After a year and a half of training, she debuted as a member of the South Korean girl group f(x) in September 2009. During an episode of the group's reality show, Go f(x), Liu revealed that her parents initially had mixed feelings regarding her music career. She stated: "My dad was very cautious, at first ...but then my mom was always supportive from the beginning. I really thank her and she also convinced my dad".