Seo Yul is the chief of the Rescue Department and an explorer in charge of search-and-rescue at dungeon accident sites. In a life-or-death moment during a rescue operation, he is captured by the dungeon boss while trying to save a teammate—only then does he awaken to the hidden class “Labyrinth Architect.” Gaining the ability to design and grow a labyrinth that belongs solely to him, Seo Yul begins using his evolving dungeon as a weapon and a shield to confront the global crises that threaten the world.