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Zhang Shinan is a newly graduated trainee police officer who was arranged by his family to work in the county. Not long after he started working, Zhang Shiyou's father died of illness. He went home to accompany his child. However, Zhang Shiyou became mentally retarded because he could not accept the reality of his father's death and felt guilty about his father. For better or worse, at this time, the small county town was not in peace, and murders occurred one after another...

In a quiet and peaceful town, the only policeman was killed. Zhang Zhe, a young policeman who had just arrived in the town, was the old policeman's sponsor. They had sympathy for father and son. The murder of the old policeman disrupted his fantasy of living with the old policeman. Zhang Zhe kept investigating who killed the old policeman, but a series of incredible things happened...

The protagonist Zhang Mingzhe is a middle school history teacher. He is obsessed with history. His daily nine-to-five life is boring and boring, but he also enjoys it. Everyone is a contradiction, and he is no exception. But one day he discovers that he is not himself, and that another self in his parallel world affects everything about him.