Oldboy (2003)

Oldboy tells the story of Oh Dae Su, who was locked in a hotel room for 15 years without knowing the purpose of the kidnappers. One day, Dae-su is released with a phone. The first call, the other side of the line is who kidnapped Dae-su. Why he did it? And for what? Oldboy is considered a “powerful film not only because of what it represents, but because it has been stripped of the human heart,” and was voted one of the ten best films of Asia.