Jiang Zishan is a policeman of the West Kowloon Crime Squad who looks gentle and refined, but calm, thoughtful and objective. Working alone with Xu Fei, he can always make full use of each other's keen observation and rich experience to solve strange cases repeatedly. Because Zishan helped him set up many strange cases and his career improved day by day, he admired Jiang Zishan very much. The two also gradually became an invincible partner in cooperation. In life, this pair of good partners is entangled in two relationships respectively. Xu Fei has always been fond of Qianqian, who is also his ex-girlfriend who has been missing for many years. A spark of love. But a happy life is always short-lived, and things backfire. In what should be a beautiful life, Xu Fei suddenly receives news from his ex-girlfriend. . . But Jiang Zishan didn't want to abandon his girlfriend Wanlan out of friendship, so he had to separate from Xinru who really loves each other