I Saw the Devil (2010)

Directed by Kim Jee-woon, is a South Korean thriller masterpiece which tells the story of a secret agent who seeks vengeance against a sadistic serial killer after the murder of his fiancee. The film features stunning cinematography and unrelenting tension, blurring the lines between good and evil. Lee Byung-hun's performance is exceptional, as is Choi Min-sik's chilling portrayal. It is perfect for anyone who loves intense and thought-provoking thriller for its gripping plot, exceptional acting, and expertly crafted suspense.