Synopsis

Lee Yong-gu is a mentally challenged man with an intelligence of a 6-year-old, which is actually the age of his own daughter Ye-sung. The two of them lead a happy life while Yong-gu makes a living by working as a parking attendant at a local supermarket. When the police commissioner's young daughter dies in a strange accident, Yong-gu, who happens to find her is falsely accused and sentenced to death for abduction, sexual assault, and murder of a minor. Ye-sung is sent to a childcare institution and Yong-gu gets imprisoned and assigned to Cell No.7, the harshest cell in a maximum security prison. At first, other inmates in the cell keep their guard against Yong-gu, then realize that there's something wrong with him. One day, he saves his fellow cellmate, an influential figure in the prison, from an attack by his rival. In return for saving his life, Yong-gu is granted a wish: to see his daughter Ye-sung again.

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