The Adventurer Lives in a Labyrinth Want to Resign the Dungeon Master.

Wade, a labyrinth-specialist adventurer, ventures into a dungeon to obtain a detection-type artifact that can help him find the avenger of his comrades. He enters the dungeon alongside an exploration team led by nobles, but a massive dragon blocks their path, wiping out the entire team. Determined to fight for his life, Wade battles the dragon but is overwhelmed and sustains fatal injuries. However, when he wakes up, his wounds are completely healed, and he has somehow become the Dungeon Master!? (Source: Takeshobo, translated)