Criminal police captain Cheng Ye identified the silent forensic doctor Shen Zhao as a serial killer. The evidence was conclusive and shocked the whole city. After the autopsy results came out, neurotoxins that did not belong to Shen Zhao were found in the corpse. The only way to produce this toxin was the human experiment that was covered up three years ago. Lin Wanfeng's forged report, Chen Ya's silent sign language, and Zhao Shouyi's surveillance deletion, layers of shady stories emerged. Shen Zhao did not kill anyone, and he was being used as a 'living template'. The real murderer knows all his habits, fears, and even childhood traumas - because the murderer is who he once was.
