Shen Yanzhi, the hot-tempered captain of the police force, meets Su Muyan, an overseas detective who has come to Shanghai to find the truth about his father's old case. A murder case in a secret room of an ancient house forces two people with different personalities to work together. He relied on his experience to solve the problem, he used his professionalism to trace the traces, and the secret pattern on the copper plate led to the old mystery. In the ups and downs of troubled times, the two heroes stand side by side, pursuing the truth in the fog, and gradually develop a tacit understanding in the confrontation. Solve one difficult case after another!
