Muyeong, a golden-spoon heir of the underworld, gets dragged into a horror game as the representative of 'Yongguk' after an unexpected accident. Everyone expects a miserable death for him, the weakest F-rank of all—until a vicious dungeon boss suddenly drops to its knees and cries out, "Young Master!" It turns out his family rules the horror world as its absolute overlords. His father is the Ten-Judgment Yama, his mother the Millennium Corpse Queen, and his sister a grim reaper! Every notorious boss in the horror world is his relative—so what use is this death survival game anyway?