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).
Krystal was born as Chrystal Soo Jung in San Francisco, California, where her family settled from South Korea in the 1980s.
During a family trip to South Korea in early 2000, at the age of five, Krystal and her sister Jessica Jung were spotted by talent agency S.M. Entertainment, which earned her a cameo appearance in Shinhwa's "Wedding March" music video. The agency offered Krystal and her sister singing and dancing lessons in order to professionally train them for a singing career. However, the offer was turned down by her parents, who reasoned that Krystal was too young, so they only allowed her older sister to join the agency at first. Her sister later debuted as a member of the girl group Girls' Generation. The Jung sisters have since appeared together in many events.