22 of the Best Korean Horror Movies to Watch Right Now

"I Saw the Devil" is a 2010 thriller starring "Oldboy"'s Choi Min-sik. Choi plays a bus driver named Kyung-chul, who is secretly a serial killer. One night, he offers to help fix a pregnant woman's flat tire after she's stranded on the road and ends up beating her, decapitating her, and throwing her remains into a river. After her head is found, the woman's fiancé, an agent for the National Intelligence Service, is determined to find her killer and make him pay.