Hui Chun-sum is an elite detective of the O-Ji, brave and capable, highly regarded by his superiors and admired by his colleagues, but his ultimate dream is to join the Flying Tigers. Another elite detective of the O-Ji, Shen Wei-li, has a shrewd mind and rich experience. Although the two have completely different ways of doing things, they appreciate each other and complement each other's shortcomings. The police force was ambushed by gangsters and suffered heavy casualties. In order to find out the mastermind behind the scenes, Chun-sum gave up his dream to stay in the O-Ji. In addition, Chun-sum and Wei-li also have to face a series of twists and turns, mysterious and unpredictable cases! The two use reverse thinking, psychological games, and careful analysis to deconstruct the criminals' thinking motives! The net of heaven is vast and nothing is missed!