Chrystal Soo Jung (born October 24, 1994), professionally known as Krystal, Krystal Jung or Jung Soo-jung (Korean: 정수정), is a Korean-American singer and actress based in South Korea. She debuted in 2009 as a member of the South Korean girl group f(x) and has further participated in SM Entertainment's project group SM the Ballad. Aside from group activities, she has also acted in various South Korean drama series such as The Heirs (2013), My Lovely Girl (2014), Prison Playbook (2017), The Bride of Habaek (2017), Player (2018), Search (2020), Police University (2021) and Crazy Love (2022).