Lee-yoon, the youngest son of House Sermin, a prestigious family on the Drea Continent. The once-peaceful family began a downward spiral into ruin following the disappearance of his father and brothers. And at the moment everything crumbled, Lee-yoon was captured by House Paton and met his end after enduring horrific torture. However, where he opened his eyes was not reality, but Adeon—an endless battlefield and the playground of the gods. In that place where countless players lost their lives, Lee-yoon rose to become the "Ghost King"—a Master Player who mastered the Assassin, Necromancer, and Ghost classes—and challenged the God. Though he met his end in defeat, his story did not end there. The moment he awoke again, he had returned to his 12-year-old self, retaining the powers of a Player. To prevent his family's fall and reclaim everything he lost, Lee-yoon begins to turn reality into his own game board. His first step is bloody vengeance against House Paton, the rival great family that destroyed House Sermin and killed him.