Glumph

Reborn as a sword, I lived for several hundred years, spending my entire existence looking after everyone. Then, out of nowhere, I took over the body of a fifteen-year-old uncouth first prince. "Do you have any idea how many I've raised?" The great knight once called the Undefeated, the Dragon Slayer who brought down the Mad Dragon, the Mercenary King, and more... I raised every single one of them. The Magic Sword Gruhorn possessed the body of the uncouth first prince...And has begun to write a new legend.

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...