Miracle in Cell No.7 (2013)

Lee Yong Gu is a mentally impaired father with the intellect of a six-year-old, who lives in a run-down house along with his daughter of the same age, Ye Seung. The police quickly take advantage of his disability and force him to admit to committing the crimes, while ignoring exonerating evidence. Yong Gu is imprisoned and assigned to Cell No. 7, the harshest cell in a maximum security prison.