Oh Dae-su (Choi Min-sik) is an obnoxious businessman who is kidnapped on a rainy night and imprisoned in a private, hotel-like cell. He is kept there for 15 years, never knowing why or who is holding him. Suddenly, he is released, given a new suit, a cell phone, and money, and has five days to figure out who imprisoned him—and why—or the mystery will remain unsolved forever.
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