In 2030, Dungeons are a grim reality in South Korea, and Paul is an F-class hunter whose life is a struggle to protect his younger sister, Lily. In an act of desperation within a doomed dungeon, he touches an ancient entity and is cursed with the power of a Kyuubi. The price? His human body has become that of a monster, making him a fugitive in a world that hunts monsters. Now, Paul must master this forbidden power growing within him, climbing from a nobody to a hero while hiding his secret from the dreaded Hunter Association. His only anchor is Lily, who shares a similar transformation, and the invited support of three powerful women: a tsundere wind genius, a berserker fire genki, and an ancient vampire with obsessive love. Together, they will form a dysfunctional home while facing threats from dungeons and humans, proving that the strongest family is not the one you are born into, but the one you choose – and protect at all costs.