짙은 (Zitten / Seong Yong Uk (성용욱); born on January 29, 1980) is a Korean indie pop/folk singer. Zitten debuted as a duo in 2005 with the self-produced mini-album Rock Doves. Three years later, in 2008, they re-debuted as indies artists under Pastel Music with the self-titled album 짙은. In 2010, after the release of their second mini-album Wonderland, Yoon Hyeong Ro left the duo to begin his two-year mandatory military service, leaving the vocalist Seong Yong Uk the only remaining member