An associate professor assigned by a mysterious criminal organization to conduct secret research at University X died unexpectedly. In order to investigate the cause of death and search for research results, Li Jiawei, a newcomer in the organization, aliased as Xu Zhe, and police undercover Lin Hai, aliased as Lin Dachuan, came to X University at the same time. Two fake students, ostensibly studying, but actually investigating secretly. After learning about Xu Zhe's orientation, the police sent Lin Dachuan to pretend to pursue Xu Zhe. Just when he was about to realize that the fake show was actually going to happen, Li Jiawei's first love boyfriend was killed and replaced the professor who died accidentally. Did he have anything to do with the professor's death? How will their relationship develop?