Forensic doctor Shen Du stitched up corpses for fifteen years until he discovered that some of the marks on the corpses were not left by humans. They belong to something called "rules". And the "rules" never come back empty-handed. In the process of being exposed to "rules" cases again and again, he gradually changed from a passive dissector to one who actively investigated the truth about "rules". And in the end, he discovered that he himself was also within a "rule".
