In 1997, Li Longjiu (Liu Chenglong), a mentally retarded man with only 6-year-old children's IQ, and his lovely daughter Yi Sheng (GE Suyuan) depended on each other. Although the life was simple and poor, it was full of happiness. One day, long Jiu, who persisted in buying a beautiful girl soldier schoolbag for his daughter, was accidentally involved in a case of abduction, rape and murder of a young child, and the deceased turned out to be the daughter of the police chief. Longjiu was ignorant and confused about the situation, so he was thrown into prison. In cell 7, there are smuggler Yang Hao (Wu Da-soo), fraudster Cui Chunhao (Park Yuan Shang), adulterer Jiang Wanfan (Kim Jung-Tae), intimidator Xu (Kim Ki-Chan) and robber Shen Fengzhi (Zheng Wanzhu). Long Jiu's childlike innocence gradually moved these "big villains", and they even risked to bring Yi Sheng into the cell to meet their father. In the dark, cold prison, cell 7 was full of sunshine.
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