Chrystal Soo Jung, professionally known as Krystal, Krystal Jung or Jung Soo-jung (Korean: 정수정), is a Korean-American pop 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).

The Bride of Habaek is a South Korean television drama spin-off of the 2006 sunjung manhwa Bride of the Water God by Yoon Mi-kyung. The series stars Shin Se-kyung in the title role alongside Nam Joo-hyuk, Lim Ju-hwan, Krystal Jung and Gong Myung. The series aired on cable channel tvN every Monday and Tuesday at 22:55 (KST) from July 3, 2017 to August 22, 2017.