Amber Josephine Liu (born September 18, 1992 in Los Angeles, California, United States) known professionally by the mononym Amber (μ λ²), is an American singer-songwriter currently active in South Korea. She is a member and the rapper of the South Korean girl group f(x). Amber made a solo debut and released her first mini album titled Beautiful on February 13, 2015. Amber released her mixtape Rogue Rouge for free on Soundcloud on April 15th, 2018. Read more on Last.fm