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A best friend is a close friend who is stronger than a best friend. When Dong Xiaoyue was in a hot spring, his best friend Tong Xin accidentally saw the bruises on his body, which ignited Tong Xin's professional excitement as a police officer and curiosity about secrets. With the private investigation, there are more and more things that Tong Xin cannot understand, which are also accompanied by the emotional confusion and helplessness of being an older leftover girl. Dong Xiaoyue is not only trapped in problematic emotions, but also becomes the target of a serial murderer. The rescue required not only police courage but also psychological insight. The rescued Dong Xiaoyue took the risk to help Tong Xin catch the real criminal in order to atone for his sins.