I Beat Up the Princess from the Start: Please Forgive My Ignorance

He was a dirt-poor nobody, a petty bandit who couldn’t afford treatment for his gravely ill mother. With no other choice, he took a desperate risk and went robbing, only to be shot dead by an undercover policewoman. He transmigrates to a parallel world’s dynasty and becomes the son of a fallen noble family. Then, in a moment of carelessness, he beats up a princess and, through a bizarre twist of fate, is forced to marry her. From there, the bandit turns his life around!