Lin Xulai, an ordinary company employee, accidentally traveled back to high school and encountered a talking mirror in a small dark room, but the person in the mirror shouted "Save me". Lin Xulai, who didn't know why, was forced to spend his high school life while investigating clues about the man in the mirror. In the process, he met Gao Lishan, a private detective who was investigating the dark room. However, time and space continued to distort, and Lin Xulai was forced to travel back to the original timeline. Their investigation had to be terminated, but this seemed to be an opportunity for the two of them to conduct a comprehensive investigation. Under the darkness of power, how did they rescue the man in the mirror...
Purpose: Against campus bullying