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

Summary

In a reflective moment outside a detention center, Xiao Mu and two police officers ponder an unusual case where all evidence points to suspect Dong Qiang, yet they believe he is innocent. They consider the possibility of a "knowledge blind spot"—an area unknown to investigators. Xiao Mu's investigation leads him to a doormat at the crime scene, where he realizes the absence of footprints, indicating a third person's involvement. Despite Dong Qiang's urgent entry, no traces remain, suggesting a concealed figure may have opened the door. The absence of evidence contradicts expectations, hinting at a complex scenario that challenges assumptions and reveals deeper secrets.

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