It tells the story of police detective Song Nanci and forensic pathologist Meng Yanche who are forced to cooperate to investigate a serial murder case. When a series of corpses with strange smiling expressions appeared in the corners of the city, two professionals with very different personalities had to work together to fight a cold-blooded killer who was proficient in medicine. As the investigation deepened, they discovered that all the victims had participated in a problematic drug experiment, and the murderer was eliminating relevant personnel one by one in a "just trial" manner. Under the pressure of bureaucratic resistance and public opinion, the incompatible pair must solve the medical mystery before the murderer completes the "death list", but they do not know that the most dangerous clue points to Meng Yanche's past. This is a battle about the boundaries of justice, and a journey of two lonely souls finding mutual understanding in pursuit of the truth.
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