Su Moran was born in a family of demon slayers, and was sent to a couple's mansion soon after she was born. The kind-hearted couple also took in a child, her so-called "brother" Su Moying. Their identities were incompatible and they killed each other, but they had become like siblings over the years. But in order to maintain the status of his family, he can do whatever it takes. At this time, Shangguan Ruoli also sneaked into the human world quietly, which triggered a series of strange events in S City. And Su Moran accidentally fell into a severe coma under the strange light, and his body disappeared, but his soul was attached... The Detective Agency of No. 19 Middle School decided to use his life to break into these strange events one after another without hesitation, no matter what the price, he must find out every truth. Could it be that, besides Shangguan Ruoli, there is someone else trying to manipulate this puppet string behind the scenes?
This is a college detective novel full of youthful fantasy. It uses an unconstrained plot to construct a waltz of youth.