Nan Yu (played by Kong Xueer) is the protagonist of a Mary Sue game. When she wakes up, she finds herself in the Republic of China and shares a body with Gao Han (played by Li Geyang), the male protagonist of a detective game. One studies love all day, while the other studies murder all day. The two enemies are forced to solve strange cases together. The two compete with each other but must cooperate. Let's see how the CP of enemies solves the murder case in the Republic of China.