In a world where hunters, human warriors who possess magical abilities, must battle deadly monsters to protect mankind from certain annihilation, a notoriously weak hunter named Sung Jinwoo finds himself in a seemingly endless struggle for survival. One day, after narrowly surviving an overwhelmingly powerful dungeon that nearly wipes out his entire party, a mysterious program called the System chooses him as its sole player and in turn, gives him the extremely rare ability to level up in stats.