Jinwoo and his party appear to have cleared a low-level dungeon, when a hidden path to an unfamiliar temple is revealed. There they encounter a set of commandments and a group of monsters that cause them absolute despair.

Having entered the instance dungeon located inside the subway, Jinwoo levels up time and time again by fighting waves of magic beasts. As he gradually makes his way forward, he finds a long stairway leading deeper underground.