"What? You think I'll forgive you after everything you've done to me?"
The protagonist had lived a life where even his parents, younger brother, and fiancée looked down on him, treated him like a fool, and verbally abused him. One day, he realized that he had reincarnated as a game character he had lovingly developed and played in a previous life.
Of course, the character he had nurtured was incredibly powerful and could even defeat dragons with ease in the game. Now, the protagonist resolves to use his newfound strength to deal with anyone in his way by punching them without hesitation (resolving things through force).