Amber Liu(엠버) is a Taiwanese American rapper. She is the rapper for f(x) and was selected as an SM Entertainment trainee through the "2007 SM Entertainment Global Audition". She is best known for her androgynous appearance, which created many discussions about her image and garnered her numerous female fans.

In 2008 moved to South Korea and trained for a ano and a half. She debuted as the rapper for the girl group f(x) in 2009, and her neutral, boyish image created a gender debate amongst netizens.