Chrystal Soo Jung (born October 24, 1994), better known by the mononym Krystal, is an American singer and actress currently based in South Korea. Discovered by S.M. Entertainment in 2000, she began filming for commercials and music videos in 2002, and officially signed with S.M. as a trainee in 2006. She is a member of both the South Korean girl group f(x) and the ballad group S.M. The Ballad, and has participated in various television dramas such as High Kick 3, The Heirs, and My Lovely Girl.