The disappearance of a high school girl in 1993 still remains unsolved as Sang-hyuk, who was in charge of the case, has disappeared from the human world for decades. Sang-hyuk is convinced that the culprit of the missing high school girl case and the culprit of the Inwang Mountain missing woman case are the same person, and he actively participates in the investigation. Meanwhile, Baek-ryeon...
