Frustrations of a Self-Proclaimed Villain Lord

The Grand Duke of the Empire has one ambition: to be the ultimate villain of all eras. But why is it that every villainous scheme he concocts ends up backfiring?

He tries to poison the Crown Prince. Ends up healing said Prince's chronic illness and earns himself a loyal follower.

He tries to steal the Grand General's new woman. Ends up rescuing a captive slave and earns himself a nominal fiancée.

He tries to take over the church. Ends up culling a demon cult and earns himself a holy army.

He tries to destroy the world. Ends up saving it.