第4話: 地下鉄ダンジョンで魔法獣と戦い続けるジヌーが何度もレベルアップする

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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. (Source: Crunchyroll)