When the war between the aboveground and underground ended, humanity was joined by so-called 'dungeon babies,' those gifted with supernatural abilities and an obsession with the labyrinths below ground. Despite being a dungeon baby, Kim Jinwoo suppressed his instincts, choosing to live an ordinary life as a guide and caring for his family. But when an expedition goes wrong and he somehow ends up becoming the new owner of a labyrinth, he discovers that he cannot ignore his instincts forever...

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The descendants of mankind, born in the labyrinth and raised on the milk of monsters, possessed special strength and strong bodies. When they returned to earth, mankind referred to them as dungeon babies. Among them, Kim Jinwoo was born in the deepest labyrinth.

“I never tried to become strong, I just wanted to live.”

From the lowliest excavator to the king of the labyrinth, his life story is now unfolding.