There is a reason this MC is completely batshit. He literally has nothing left except revenge.
This is also why she left the princess alive, with primary target of vengeance dead he would lose his purpose.
GIFTING half of the wealth as a dowry? You fucking dumbasses, if youd keep the money but offer support as long as she is kept happy things would never have gone where they went.
Chunky Su is one thing but her father seems to have been an idiot as well.