Johnston (Andy Lau), once an outstanding detective of "O Ji", lost his sight four years ago due to a case. Now, with a dark vision in front of his eyes, he still enjoys picking up the long-standing and unresolved headless cases to investigate, and wins a generous reward while seeking justice for the victims. He has a unique way of judging cases, and is good at restoring the scenes and moods of the parties in his mind to track down clues. In the process of tracking down the suspects of the "drainage water injury incident", Zhuang accidentally met He Jiatong (Sammi Cheng), a subordinate of Situ Fabao (Guo Tao), a good buddy of "O Ji". Although He lacked experience in handling cases, he was very skilled and saved Zhuang who was in a critical moment. She admired this once famous "God of Solving Cases" and asked Zhuang Sir to take over to help investigate the whereabouts of her friend Xiaomin who disappeared many years ago. For the sake of the million-dollar bounty, Zhuang nodded and agreed. In just ten days, Zhuang Sir and He Jiatong were involved in several cases at the same time. The truth of each case surfaced alternately, and their hearts gradually drew closer in the process of life and death trials...