It started in a university called Qingzhi. Ji Shaolang, a boy from another world, was ordered by the Lord of the World to come to the human world to investigate various unnatural events caused by the filth in the demon world. During the investigation, he got acquainted with Lin Yi, a girl from the human world, and Wang Xiaoran, Lin Yi's childhood sweetheart, Zhou Yang, a super academic, Ye Yahan, a super rich woman who had dreamed of being a detective since childhood, and Su Zhengxuan, a boy with super computer skills. Then the six people investigate strange events in the human world and discover the truth one by one. There is happiness, sadness, and a lot of helplessness in getting along. In each case, the story is about young girls and boys growing up, progressing together, and gaining precious friendship and love.
