The walls of the capital are crumbling, and the scent of iron and ash hangs heavy over the ramparts. For ten years, the strategy game Protect the Empire stood as an unbreakable fortress of code, a nightmare of resource management and brutal difficulty that broke even the most seasoned players. Then comes the miracle. A legendary streamer known as "Mr. Gamer Geek" finally cracks the impossible code, achieving a perfect victory on the highest difficulty setting. But the victory screen does not bring fame or rest. Instead, the world dissolves, and the cold reality of the battlefield replaces the comfort of a gaming chair.

Waking up in the body of the disgraced royal Prince Ash, the strategist quickly realizes that this is no longer a simulation. The pixels have turned into real blood, and every cold-blooded sacrifice he once made for a high score was a death sentence for a living person. Now, the monsters are breaching the gates, and the same hellish onslaught he once controlled with a mouse is threatening to tear his new life apart. He has the knowledge to win, but this time, the cost of a mistake is measured in the lives of his companions. Can he rewrite his legacy of ruthless efficiency into a path of survival, or will the mystery behind his summoning bury him in the rubble of his own kingdom?

Also known as: Tower Defense-ui Pokgun, 타워 디펜스의 폭군, How to Live as a Tyrant in a Tower Defense Game.