The story takes place in Shanghai in the early 1930s. Guan Qingshan and Guan Qingyue are twin brothers and sisters. Guan Qingshan, who was on patrol, disappeared inexplicably. In order to find out the truth, sister Guan Qingyue disguised herself as her brother Guan Qingshan and entered the patrol room where he used to work. Guan Qingyue's agility and skill allowed her to succeed in solving cases many times. However, Shanghai's gangs were so intricate and complex that it was difficult for Guan Qingyue to reveal the truth of the case on her own. Fortunately, the upright Detective He Zhongxin firmly supported her. From then on, the two of them fought side by side to clarify right and wrong and uphold justice as police officers. Focusing on the strange clues in these cases, Guan Qingyue persevered in conducting secret investigations and unraveling the mysteries of the strange events. Finally, she discovered that the biggest culprit behind the scenes was the Japanese. Her brother's disappearance was also due to the fact that the Japanese sent people to assassinate Guan Qingshan, who was pursuing the matter, in order to prevent the patrol room from detecting the matter. After understanding the truth, Guan Qingyue had family feud and righteousness in mind, and went through all kinds of hardships to find her brother Guan Qingshan who survived the catastrophe. Unexpectedly, Guan Qingshan lost his memory because of his injury. At the same time, Guan Qingyue gradually discovered that Guan Qingshan had an unknown past and was coerced by the Japanese. Guan Qingyue managed to cure his amnesia. Inspired by brother-sister love and patriotism, Guan Qingshan regardless of personal safety...
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