Yu Jun-sang is a South Korean television, theater and singer actor.He is a member of the Namoo Actors (나무엑터스) agency. In August 1998, he joined the cast of the series White Nights 3.98 where he gave life to Kim Jin-seok, an intelligence agent of the ANSP, until the end of the series in November of the same year. In 1999, he joined the recurring cast of the series Goodbye My Love where he played Song Dae-ho, the friend of Chang Min-soo (Ahn Jae-wook).
On May 6, 2010, he appeared as part of the main cast of the movie Hahaha where he played Bang Joong-sik, a film critic and friend of film director Jo Moon-kyung (Kim Sang-kyung). On July 14 of the same year, he appeared as part of the main cast of the movie Moss where he played the prosecutor Park Min-wook. On September 8, 2011, he appeared in the main cast of the movie The Day He Arrives where he played Seong-jun, a professor of film studies.
Source: Wikipedia