Levelling Up In An Exclusive Dungeon

Story:

For years, Kang Jin-hyeok was a D-rank hunter. Because the main guilds dominated the hunting areas, he could not level up and was forced to make ends meet with part-time occupations. One day, his room becomes a dungeon. This is a dungeon, right? Now that he has the dungeon at his disposal, Jinhyuk starts to level up, hunt, and progressively get stronger. "You major guild scumbags who looked down on me, just wait and see!" With this dungeon, I will grow stronger!