Since then, certain humans have awakened to supernatural powers. We call these individuals "hunters." Hunters make their living by using their powers to conquer dungeons inside the gates.

In this world of tough customers, the low-ranked hunter Jinwoo Sung is known as "the weakest hunter of all mankind." One day, Jinwoo gets fatally injured when he runs into high-rank double dungeons hidden within a low-rank dungeon. Just then, a mysterious quest window appears in front of him.

Now, Jinwoo begins a journey to become the strongest hunter and unravel the secrets behind his unique powers and the world’s dungeons.