Zheng Qian, the shame of the criminal investigation team, took the initiative to create a vicious injury incident and sent himself to death row in order to overturn the unjust case of extermination of his family three years ago. In prison, he met Inspector Shen Muzhi, who was imprisoned for the purpose of hunting down the culprits. With the help of Gu Fanghua, the female prison doctor on death row, and Tu Gang, the cell leader, the two turned from sworn enemies into partners in prison. When Zheng Qian discovered that the detachment leader Zhou Xianzong was the mastermind behind the scenes, and that Shen Muzhi's biological father was actually the real murderer of the family, a trapped beast fight broke out between the cell and the police station at the same time.
