Synopsis：Five years ago, Cheng Ye’s older brother, Cheng Shen, was killed while investigating the “Twin Flowers Serial Murder Case.” The evidence pointed to Jiang Yanbai, but he was never convicted due to an alibi. Five years later, the case resurfaces, and Cheng Ye is forced to work with the returning Jiang Yanbai. During their joint investigation, the two go from suspicion to mutual trust, and in the end, the truth is revealed.