Since portals have connected the real world with dungeons full of monsters, people with special abilities have awakened to hunt these monsters and earn their living. Jin-Woo Sung is one of these Hunters, but he is only referred to as "the weakest" by his colleagues. However, in a dungeon, he unexpectedly receives a quest that allows him to level up. Can he truly fight his way to the top and become the strongest of all Hunters?.