Former medical examiner Lin Mo was ruined due to a miscarriage of justice, and disappeared into the darkness to become a "scavenger" specializing in handling death scenes.
When he discovered that many "suicide" cases had the same evidence as the unjust cases - blue fibers in the nails of the deceased, he realized that he was falling into a well-designed trap.
Su Wan, a female detective who is persistent in the pursuit, follows the trail. From confrontation to cooperation, they gradually uncover a series of murders that spanned ten years.
The real murderer walks under the sun in the name of the guardian of the law, treats killing as an art, and turns tracing into hunting.
When the secret of "Scavenger" was exposed, Lin Mo was wanted from all sides in the city.
He must use his professional knowledge to find flaws in the perfect crime scene and make a choice between cleansing his sins and revenge and redemption.
