The Sealed Tale

A storyteller holds court, weaving a tale of a woman’s murder that occurs on a dark, densely foggy night. Elsewhere, a man scribbles on a pad, clearly in a fugue state. He is a 'mudang', or psychic; a condition inherited from his mother. The tales he relays to the storyteller are remarkably identical in every detail to a recent spate of murders, therefore he is clearly the murderer.