The Regressor Is A Piece Of Shit

Kang Sungmin almost saved humanity once. He was called a hero, but only because history was written by the people who survived him. He sacrificed cities, poisoned allies, betrayed nations, and made choices so ugly even the Great Demon King found them offensive. Then he died. Now Sungmin has returned to one month before the apocalypse, armed with future knowledge, a terrible personality, and absolutely no interest in becoming a better man. The world needs a Hero... but it got him instead.