Ock Ju-hyun (옥주현, born March 20, 1980), officially Oak Joo Hyun, is a K-pop singer, known mostly for her role as the lead singer for South Korean girl group Fin.K.L. After their unofficial breakup in 2002, Ock released three solo albums and has participated in musicals, namely Chicago, Aida, and Cats.
Fin.K.L debuted in 1998 and quickly became popular, catapulting all its members into stardom. Ock served as the lead singer for Fin.K.L until its unofficial breakup in 2002; she has since taken part in Fin.K.L's digital single "Fine Killing Liberty" in fall of 2005, including filming the music video.
Starting her solo career in summer of 2003, Ock came out with a ballad called "난..." ("Nan...", meaning "I..."), which entered the top 10 of Korea's music charts. By her second album, which came out in the fall of 2004, the public was startled by the sudden change in appearance, as she had experienced a significant weight loss; Ock attributed to her intense yoga training. Her popularity rose and she was able to perform on various music shows for a lengthy period with her singles "Catch" and "Sweet Rainyday".
Her third album, titled Remind, was released on June 12, 2008. The first single off the album is "Honey", which is a departure from her previous singles as it incorporates R&B. She began her comeback performances the following weekend on the major music shows.