Detective Seo Do-cheol (HWANG Jung-min) and his 老足Major Crime InvestigationDivision tirelessly track down criminals day and night, often at the expense oftheir personal lives.When the murder of a professor reveals links to past cases, suspicions of aserial killer arise, plunging the country into turmoil. As Major Crimes delvesinto the investigation, the killer taunts them by publicly releasing a teaseronline, indicating the next victim, and intensifying the chaos.To tackle the escalating threat, the team brings in idealistic rookie officerPark Sun-woo (JUNG Hae-in), leading to unexpected twists in the case’strajectory.

(责任编辑：探索)