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.
Secret Investigation Record is based on cases detailed in the Annals of Joseon History with a bizarre twist; these incidents incorporate mysterious, supernatural elements that cannot be explained through science. Kim Hyung Do is an inspector of the state whose single-minded focus on his investigations into administrative misdeeds bring him into direct contact with these strange mysteries. Heo Yoon Yi is a government employee who aids him and attempts to understand these scientific impossibilities with an open mind, in contrast to his cynicism.
