When he was a young boy, Si Mun, the grandson of a renowned shaman, possessed the ability to see and communicate with ghosts. His grandmother gave him a talisman that temporarily removed this ability and erased his memories of any supernatural events he had witnessed. Years later, Si Mun holds a busy but ordinary position as a homicide detective in the Korean police force. His grandmother has since passed away—and the powers she sealed away seem to be reawakening...