Mirae gets an offer of a K-pop trainee contract. She looks back on her short life and finds her past that would ruin her future career and reputation, as she dreams of becoming a k-pop star. Most of all, her ex-boyfriend, Jaemin, is the most worrisome. She starts to clear her past and sets out to find Jaemin.

The veteran detective Seo Do-cheol and his team at Major Crimes, relentless in their pursuit of criminals, join forces with rookie cop Park Sun-woo to track down a serial killer who has plunged the nation into turmoil.