Realised that there isn't a thread for this talented actor. Watched him in My Brother and Welcome to Dongmakgol.
Here's a list of movies he has starred in:
The Happenings (1998)
The Spy (1999)
Coming Out (2000)
The Foul King (2000)
Joint Security Area (2000)
Guns & Talks (2001)
Sympathy for Mr. Vengeance (2002)
No Comment (2002)
Surprise Party (2002)
Save the Green Planet! (2003)
A Man Who Went to Mars (2003)
My Brother (2004)
Welcome to Dongmakgol (2005)