@Dragontrainer see now you seem like a reasonable person so I'll bother replying to you. Perfectly reasonable to want to see significant changes in his personality before judging him differently, all i really have to say is in manhwa terms we are still relatively early on in the story. Hell it's...
People in this type of manhwa always judging characters for what they are yet to do in this timeline... sure it was awful, and it would make you prejudice against them but they've done nothing of the sort yet. Right now her dad is simply a man who is struggling with parenthood with his only daughter