I have always liked criminal psychology, so I always wanted to explore and write about it. I finally made up my mind to start writing today. Everything is still in the exploratory stage. This article mainly tells the story of Qin Hao, captain of the Canghai City Criminal Police Team, and Shen Mingxuan, a rookie, who solved cases together and fell in love day by day. The case is the main line and love is the supporting role. The rhythm is maintained at three chapters per case, and five cases per theme.