A murder case occurred at Jingjiang Medical University. Wei Linglong, the mother of Pu Suowu in dormitory 509, was shot dead. The suspect Pu Suowu was on the run, and the latter suddenly kidnapped his classmate... However, the police detective Peng Zuyang who intervened in the middle implicated the matter in a series of serial murders. In his fight with forensic doctor Wei Yi During the investigation, the murderer's plot was discovered, but evidence was obtained step by step every night. When they finally faced Pu Suowu, the latter not only told the "truth" that Wei Linglong had directed and acted to defraud insurance money, but also completely changed after a few days of running away. There was a sudden explosion in the dormitory building... Is this really the truth? Peng Zuyang judged it to be one of the series of "education cases" and learned about the "death contract" signed by the real murderer and the victim. The murderer who claimed to be killing people to complete "adult education" also had a huge organization hidden behind him. . .