The Founding Monarch Became the Mastermind

Jang Si-on finds himself in a mysterious world that could be either real or part of a game.

Starting as a mere mercenary, he becomes a hero who saves the world and a duke who achieves everything. Despite his success, he leaves everything behind to return to his homeland.

After half a century of searching, he concludes that he must regain his ducal realm and his family’s power.