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Kong Bi's arm mutated, bringing him into the detective game. In order to clear away the suspicion of murder, he had no choice but to reason desperately.

Delivery boy Zhang Weiming accidentally obtained the "Great Detective System" and gained the ability to call surveillance at will, solving mysterious cases and becoming an amateur detective. As the system is upgraded, surprises continue to appear. After receiving such a powerful system, he only had one wish: to get rid of the infamy of the criminal's son.