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This is the fantasy story of Fang Ji and Duan Yuli. It tells that Fang Ji and Duan Yuli were childhood sweethearts. Fang Ji's mother was killed when he was young, which also led to him not being talkative and unwilling to make friends since he was a child. Fang Ji is inspired to become a police officer when he grows up, in order to find the murderer of his mother, while Duan Yuli accompanies Fang Ji to become a police officer. After that, Fang Ji and Duan Yuli explored cases and took risks together, and finally achieved success, but they didn't know what kind of danger they would face...