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During an interview, the appearance of three strangers turned Bao Fansheng into a "potential victim." In order to survive and to find the truth, she had to participate in the work of the unknown case investigation team. Several seemingly unrelated cases all point to an isolated island. The dusty past still affects the direction of the story.

Na Ye, who graduated from psychology, unexpectedly got a new job. Following Ai Ling's team, they worked together through on-site investigation and criminal psychological analysis to complete the detection of the case. And behind each case, there are inextricably linked.

A heavy snowfall made Lin Ran stay in the small town of Jiangqi. The murders that happened one after another slowly made her fall into it.