Hey bro, you're a cop, not a thug!.

Summary

A mysterious series of police officer deaths occurred, with the fourth case being particularly bizarre. An investigator fell due to a marble, hitting a mosquito coil stand with a nail that pierced his skull. Toxic substances from long-term chemical reactions in the stand caused fatal brain damage. Despite thorough investigations by multiple experienced officers, including Dong Rui Cheng, no clear evidence of intentional murder was found. The case appears to be an impossible, perfectly orchestrated accident that defies logical explanation, leading Zhao Xiao Tang to bring in Xiao Mu to investigate the potentially sophisticated and undetectable murder method.

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