Sit Dan Yan (Johnson Lee) is not your ordinary police constable. He is an expert in geomancy, which he uses at critical moments to solve mysterious cases. He also has Leung Sing Kau (Oscar Leung), who is connected with people conducting both legal and illegal activities, as his informant. His outlandish character often leaves his superior, Che Gwai Fei (Joey Meng), astonished. She is a criminal psychologist who uses rationale to analyze everything. They appear to be polar opposites, yet through working together, they develop an unspoken mutual understanding. Outside of work, she only cares about the marriages of her younger siblings, Che Gwai Yan (Harriet Yeung) and Che Gwai Gwan (Frederick Cheng). When Che Gwai Mei becomes involved in a love triangle with Leung Sing Kau and Tit Leung Chi (Rebecca Zhu), Che Gwai Mei loses control of her emotions. Luckily, Sit Dan Yan is there to help. At this time, a series of missing persons cases occur. The culprit's modus operendi evokes Sit Dan Yan's memories of the past, which he has been hiding for many years.