Ha Jung-woo (born Kim Sung-hoon on March 11, 1978) is a prominent South Korean actor, known for his remarkable versatility and strong screen presence. He gained international recognition with the critically acclaimed thriller *The Chaser* (2008), where he portrayed a disturbed serial killer.

His career is studded with intense and memorable roles, often embodying complex, morally ambiguous, or highly pressured characters. Among his most significant films are the neo-noir *The Yellow Sea* (2010), the gangster film *Nameless Gangster: Rules of the Time* (2012), the blockbuster *Assassination* (2015), the survival drama *Tunnel* (2016), and the popular fantasy series *Along With the Gods* (2017-2018), which solidified his status as one of the most recognizable figures in contemporary Korean cinema. He is highly regarded for his ability to navigate diverse genres with equal effectiveness.