The Perfect Murder Weapon

No wounds, no poison, yet bodies keep appearing one after another. Forensic pathologist Sun Dayong embarks on a path of revenge, determined to seek justice for his younger sister, who died unjustly ten years ago. An anonymous source keeps feeding him clues, while his enemies are destroyed one by one in an invisible psychological siege. But as the truth is peeled back layer by layer, he is horrified to realize that he has long been on the list of the guilty.