Guide Yu Geong, lost his parents 13 years ago in an attack by mysterious mutant Almunten. Only him and his Hyung survived. But one day the mutant Almunten reappeared, and now his Hyung is in danger of dying. The only option in front of Yu Geon, who is at a loss, is the proposal of S-class Hunter Woo Shin-je. "Become Erewhon's guide and obey my orders. To endure everything and anything. And lastly, to follow me into the gates." Among the four hunters who have caused harm to Yu Geon in many ways, Yu Geon head to the abyss of the world.