Hunter Kang Jin-hyeok has been D-rank for years. His days were spent barely scraping by with part-time jobs, unable to level up due to the hunting grounds being controlled by major guilds. One day, a dungeon appears in his room. "<i>This is… a dungeon?</i>" With the dungeon now in his possession, Jinhyuk begins to successfully hunt, level up, and gradually grow stronger… "<i>Just wait and see, you major guild scumbags who looked down on me! I will become stronger with this dungeon!</i>"