Detective Chen Mo (gloomy and sinister, who witnessed his mother being killed as a child) meets Gu Zhun, a second-generation rich man (who is cynical on the surface, but actually wants to get rid of family control and become a photographer) because of the "Rainy Night Serial Murder Case", and they fall in love at first sight. The two jointly investigated the case and discovered a "humanity experiment" conspiracy involving Gu Mingyuan, the uncle of the Gu family. In order to resist the betrayal and separation of his family members, Gu Zhun was overbearingly protected by Chen Mo, who revealed the truth along the way, and Gu Mingyuan was brought to justice. In the process, Chen Mo puts aside the shadow of his childhood and realizes his self-worth of "becoming a good policeman"; Gu Zhun gets rid of the shackles of his family and becomes a well-known photographer, and his two-way secret love finally comes true and he reaps happiness.
