The Unworthy One

He was Earth's smartest man. Now he's a disgraced son with zero cultivation—abandoned by his fiancée the moment she unlocked "god-tier talent." His only family: a fragile younger sister, hunted by thugs who want her as a concubine. The ancient martial world laughs at him. But when they push too far? He builds a gun. Then a rocket. Then he rewrites their entire magic system with computer code. And that fiancée? She'll regret leaving.