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Since the beginning of the 21st century, economic development has been accelerating, people's pace of life has been accelerating, and the pressure of life has also been increasing. Facing such a society, some people will rise to the top and stand on the top; others will give up on themselves and resent the world. The story is mainly based on a seemingly unrelated serial murder case and tells how a group of just police officers solved the case. By the end, the perpetrator tells the story behind the crime