Xiao Su, a criminal policeman in Xiamen, was captured again by mistake during a mission and was used as a living subject for experiments. After being rescued, his brain developed abnormal thoughts and he had strong thoughts of killing every few months. This incident was discovered by Yu Feng, a psychiatrist, when Xiao Su had a murder attack. Xiao Su did not do it out of love. Yu Feng was silenced, but Yu Feng did not choose to bring Xiao Su to justice. Instead, he later helped Xiao Su commit crimes and became Xiao Su's accomplice in life and death. The two wandered between light and darkness until the mastermind behind Xiao Su's appearance appeared again. The two decided to fight this dark force to the end.
Purpose: Don't do experiments, cherish life