'' I Saw the Devil '' ( ) is a 2010 South Korean thriller film directed by Kim Jee-woon and written by Park Hoon-jung . Starring Lee Byung-hun and Choi Min-sik , the film follows NIS agent Kim Soo-hyun ( Byung-hun ) , who embarks on a quest of revenge when his fiancée is brutally murdered by the psychopathic serial killer Jang Kyung-chul ( Min-sik ) . '' I Saw the Devil '' made its premiere in the United States at the 2011 Sundance Film Festival and had a limited U.S theatrical release
2011 Sundance Film Festival
2011 Sundance Film Festival
I Saw the Devil