Seol Yeong is dispatched to Sabeol Province to investigate a strange red rain, which he discovers is caused by shamans manipulating the body of an Imoogi, a serpent that failed to become a dragon. After resolving the issue, Seol Yeong is attacked by a large number of Yoma, forcing him to flee to a nearby populated area to protect himself and others. He then faces a more dire situation when he discovers a powerful gravekeeper beast guarding the area.