Oldboy

Oh Dae-su is kidnapped without explanation and imprisoned for fifteen years in a hotel room, with no contact to the outside world except for television. The day he is released, he sets out to find his captor, armed only with the clue that someone wants him to find the answer before the question. In 2003, Park Chan-wook directed this thriller featuring the darkest third-act twist in Korean cinema, along with a hallway fight choreography that action films have unsuccessfully tried to imitate.

Oldboy is the darkest and most memorable thriller in Korean cinema: the hallway scene is one of the most studied action sequences of the 21st century. The final twist is among the most disturbing. It won the Grand Prix at Cannes.