Ten years ago, gates began appearing around the world, connecting our world to dungeons filled with monsters. Some humans awakened as "Hunters" with special abilities to fight these monsters.

Sung Jin-Woo was known as the world's weakest hunter, barely surviving the lowest-level dungeons. But after a near-death experience in a double dungeon, he receives a mysterious System that allows him to level up and grow stronger like a character in a game.

Follow Jin-Woo's journey from the weakest to the strongest hunter as he discovers the truth behind the System, the dungeons, and his own mysterious powers.