In the depths of the underground world lived the descendants who were born and raised by feeding on the teats of beasts. These individuals with special abilities and enhanced physical abilities were known as dungeon babies. Amongst them, Kim Jin-Woo was born in the labyrinth on the lowest floor. “I’ve never tried to become strong. I just wanted to survive.” This is a story of a lowly tunnel digger who ascends the throne to become the king of a labyrinth.