Manhwa Recap: After his utterly disgusting parents pass away, he discovers he has an enigmatic 500 million yen inheritance.
The boy, determined to follow his own path, decides to play the hardest online game available, "Dungeon Attack," and becomes the first player to reach the achievement of eliminating every Demon Lord. But when he responds to an enigmatic question that arises after winning the game, he unexpectedly finds himself transported into the virtual world.
He had returned as "Dantalian," the weakest and lowest-ranked Demon Lord in the game world, with a rank of 71! He fights to survive in this cruel world, relying only on his eloquence and memory of defeating the strongest Demon Lord. This is a tale of revenge and comeback!