Kim Yoon-seok (born January 21, 1967) is a South Korean actor. Kim's theater background first led him to be cast in minor roles on film and television. His breakout role came as the villain in gambling film Tazza: The High Rollers (2006), but it was his performance as an ex-cop turned pimp in surprise hit The Chaser (2008) that brought him acting awards and stardom in his forties. Kim has since become an acclaimed actor in South Korea, with notable performances in films such as Running Turtle (2009), The Yellow Sea (2010), Punch (2011),The Thieves (2012), Hwayi: A Monster Boy (2013), Sea Fog (2014), The Classified File (2015), The Priests (2015) and 1987: When the Day Comes (2017).