Shen Yi is a university teacher. One day, while giving an open lecture in the school's auditorium, the campus belle, Su He, suddenly rushes onto the stage and accuses him of deceiving her emotionally and dating her. She claims he promised her a place in an overseas exchange program but failed to honor his promise. She also transferred 200,000 yuan to Shen Yi. However, Shen Yi does not know Su He at all, so he chooses to call the police on the spot. At the school's security office, as the investigation deepens, the mystery is gradually unraveled, and the identity of the mastermind behind everything slowly comes to light.