Naryecheong, a national secret agency that protects humans from disasters and misfortunes caused by evil spirits. In attempting to recruit a successor, Naryecheong’s chief exorcist, Yoon Taehee, searches for a ‘gwijae’, someone who has the ability to see and hear ghosts. One day, Yoon Taehee, while hiding his identity and going undercover, meets a suspicious boy at a high school in a small town in the province… “By the way, how old are you, friend?”