Forensic pathologist Daniel is dragged into a citywide live-streamed serial murder case. The arrogant killer commits crimes openly, and every clue left behind points to the bizarre death of his fiancée ten years ago. Following the evidence, Daniel tracks down his former student Arthur, who confesses directly, seemingly bringing the case to a close. However, using his sharp forensic observational skills, Daniel discovers flaws in the confession. After continuous deep digging, the truth is shocking: Arthur is merely a scapegoat, and the true mastermind turns out to be his trusted supervisor, Sheriff Frank.