Lin Nian, the personal bodyguard of gang boss Zhao Tianji, was framed and imprisoned for knowing the core criminal evidence of the gang, and died unjustly. Before he was reborn and returned to prison, with his 7-day precognition ability and inherited fighting/criminal psychology skills, he lurked as a police undercover and made a sophisticated plan to bring down Zhao Tianji, save the enemy's daughter Su Bai, and complete the closed loop of revenge.