In a world where hunters, humans with supernatural abilities, must battle monstrous creatures that threaten humanity, Sung Jinwoo is known as the "Weakest Hunter of All Mankind." Constantly risking his life in low-rank dungeons to support his family, Jinwoo faces a near-fatal encounter in a hidden, high-level dungeon. Miraculously, he survives and awakens with a unique ability: the power to level up indefinitely, just like in a video game. As he completes quests, defeats enemies, and grows exponentially stronger, Jinwoo must navigate a dangerous world filled with powerful hunters, treacherous guilds, and hidden agendas. He strives to uncover the secrets behind his newfound abilities and protect those he cares about, all while ascending to become the ultimate hunter – the Shadow Monarch.