inspector jiang zishan (played by chen jinhong) is calm-headed, careful in his mind, and objective in his work. although he cooperates with the arbitrary sha zhan xu fei (played by louis koo), he can still use softness to control hardness, make full use of the other party's keen intuition and rich experience, and repeatedly break the strangeness. eee。 with the help of jiang zishan, xu fei also made many great achievements and his career has also improved. the two with different personalities have become good partners and good friends. in life, both of them are entangled in two unresolved relationships. jiang zishan and his girlfriend wen wanlan (played by charmaine sheh) have been in love for many years and their relationship is stable. wen wanlan's good friend tang xinru (played by li shanshan) falls in love with jiang zishan at first sight. after wen wanlan is imprisoned for her father's case, jiang zishan and tang xinru's slowly develop, but with wen wanlan's release, their relationship begins to shake. xu fei was unable to forget his long-lost girlfriend liang qianqian (played by xiang hailan), until he met wu qiaojun (played by xuan xuan), a psychological expert from the police force. the two sparked sparks and prepared to get married. at this time, xu fei suddenly received a message from liang qianqian that he was facing a difficult choice between his new love and old love.