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The story is set in a world where mysterious portals called "gates" have connected the human world to a realm of monsters and magic. Certain humans, known as "Hunters," gained supernatural powers to fight these creatures. The strength of a hunter is determined by their rank, ranging from E (weakest) to S (strongest). The protagonist, Sung Jinwoo, starts as the world's weakest E-rank hunter, barely strong enough to survive low-level dungeons and often mocked as "The Weakest Hunter of All Mankind". He works dangerous jobs to pay for his mother's hospital bills and his sister's education. During a routine, low-rank dungeon raid, Jinwoo and his party stumble upon a hidden, brutally difficult "double dungeon". After a sacrificial struggle, Jinwoo is presented with a mysterious "System"—a unique interface that allows him to "level up" his abilities, an ability no other hunter possesses.