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In order to find his missing sister, Lu Chen, a former trace examiner, uncovered the criminal conspiracy packaged in folklore, dismantled the criminal organization behind the scenes, used science to break superstition, and uncovered the secrets in the hearts of the people.

Lin Shen, a former trace investigation engineer who was charged with an unjust case, used his ultimate trace insight to solve impossible crimes and uncover the dark and shocking secrets of human nature wrapped in folklore.