Ha Jung-woo (born Kim Sung-hoon on March 11, 1978) is a South Korean actor. Ha studied theater at Chung-Ang University, and after several years of minor and supporting parts, he was cast in his first starring role in the low-budget indie The Unforgiven (2005), directed by his friend Yoon Jong-bin. This was followed by Kim Ki-duk's Time (2006), and Never Forever (2007) with Vera Farmiga. But his breakthrough role to stardom was in Na Hong-jin's serial killer film The Chaser (2008). Known to attract both critical acclaim and commercial success, Ha quickly became the most in-demand leading actor of his generation in Korean cinema, showcasing his versatility in road movie My Dear Enemy (2008), sports film Take Off (2009), crime drama The Yellow Sea (2010), gangster sagaNameless Gangster (2012), romantic comedy Love Fiction (2012), spy thriller The Berlin File (2013), and action thriller The Terror Live (2013). He made his directorial debut through the comedy film Fasten Your Seatbelt (2013).