Well........
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I for one love the dad.
The whole ass thing is that the daughter is the dad's "weakness" as in the king wouldn't mind hurting her to get the Duke to do what he wants, so the Duke has to act like he and his daughter aren't close for shit so the mc can be free of the danger that is the shit head emperor, that paired with the fact that the dad's a bit tsundere was just a breeding ground for misunderstandings. Also the thing in the past life with the dagger was the dad tryna tell his daughter I'ma need you to stay here for a hot sec while I go make sure everything's safe for you don't worry I won't abandon you, she saw it as repent and kill yourself when you'd like, then prince boi pulled up to free her but she thought she was finna get tortured so she kills herself (dad goes on a rage fueled killing spree after this.)
I know we are probably gonna get a sob story explanation on why he treats her like that, but it still gets on my nerves