Oldboy

A man is inexplicably kidnapped and imprisoned for 15 years and his wife is brutally murdered. On his release, he is given a wallet full of money and a mobile phone. A stranger calls and asks him to try and figure out why he was imprisoned. A girl appears and promises to help him solve the enigma and seek vengeance for his cruel fate.

As the search progresses, the man finally comes face to face with his kidnapper, who proposes a game: if the man discovers the reason for his imprisonment, his kidnapper will kill himself. If not, then the girl will be killed. He has only five days to unravel the mystery.