Where Is the Murderer?

Three serial murders occurred in Binjiang City on a rainy night. Cold numbers were carved on the wrists of the deceased: 1, 2, 3. The technique is clean, there is no trace at the scene, and the surveillance is completely blind. The murderer seems to have a pair of "eyes in the sky" and can accurately avoid all traces. Criminal investigation captain Lu Chen led the team to investigate frantically, and the more they investigated, the more frightened they became: The murderer understands criminal investigation, forensics, traces, and internal processes. He can get the briefing on the case as soon as possible, can destroy evidence quietly, can watch the police circle around, and can even stand at the scene of the crime and smile at the corpse. All clues point to the most terrifying answer—— The murderer is in the police force. Are they teammates fighting alongside each other? Are they brothers who get along day and night? Or is it the person you trust the most, rely on the most, and have the least suspicion of? The entire police station, all suspects. Whoever loses control first before the next number appears will be the real culprit. High-energy reversal｜Infernal Affairs in the police station｜Serial murders｜Unable to guess the real murderer until the end