Young composer Yeonji lands her dream job at the prestigious and isolated Forte Studio that soon reveals itself as an unsettling work environment because of the eerie atmosphere around there and odd behaviors from her colleagues and boss. But Yeonji’s fierce ambition doesn’t allow her to give up and, when she realizes that her boss uses her as a mere ghostwriter, the competitive spirit between the two arises until it escalates into a matter of life and death.

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.