[This is a fan translation]
The Exorcism Agency, a top-secret government organization, protects humans from disasters and misfortunes caused by evil spirits. Yoon Taehee, the senior exorcist of the agency, goes undercover as a high school librarian to find a 'Gwijae' who will become his successor.
There, he encounters a mysterious and suspicious boy, Kim Jaegyeom, who keeps catching his attention for reasons he can’t quite explain…