Criminal investigation ace Shen Fan was attacked and traveled through time, becoming a five-year-old child and activating the police god system. He repeatedly solved strange cases by relying on the kung fu, criminal radar and other abilities rewarded by the system. He first subdued a security guard pretending to be a human trafficker during an anti-trafficking exercise, and then was kidnapped by the real gang and put him in trouble. He also assisted his aunt Duan Xiaoyue (captain of the criminal police) to solve the kidnapping case and uncovered the mastermind Li Tao. As the investigation deepened, Shen Fan discovered that all the cases pointed to the criminal leader Zhou Hu. Finally, with the cooperation of many parties, he successfully defeated Zhou Hu's conspiracy, completely disintegrated his criminal organization, and became the nemesis of crime as a child.
