Chrystal Soo Jung (born October 24, 1994), better known by the mononym Krystal, is an American singer and actress based in South Korea. She debuted in 2009 as a member of South Korean girl group f(x) and has further participated in S.M. Entertainment's project group S.M. The Ballad. Aside from group activities, she has also participated in various television dramas such as High Kick 3 (2011–12), The Heirs (2013), My Lovely Girl (2014), and The Bride of Habaek (2017).