Ock Joo-hyun is a K-pop singer and musical theatre actress. The public knows her mostly for her role as the lead vocalist for the South Korean girl group Fin.K.L. (1998 – 2002). After their breakup, Ock has been active as a solo singer and musical actress with participation in many musicals, notably Aida, Chicago, Cats, 42nd Street, and The Count of Montecristo.
Ock made her debut as a part of Fin.K.L. group under the management of DSP Entertainment in 1998. She finished the study at Kyung Hee University with Sung Yuri and Gong Yoo in February 2005.
Ock has been in a long-term relationship with Jeff Chang, son of Korean media mogul.