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He didn't change. he adores her from the start but he's bad at expresses his feelings. He was always on her side. That's why he allowed her to kill him even though she is so weak. In the original novel, the story wasn't from the father pov and the Princess because of the noble gossip and her father cold personality she misunderstood him.

http://www.zihuji.com/index.php?m=&c=mh&a=bookinfo&mhid=253&xji=1
Found this website, hope that helps

lmfao sorry she just looks like jeanette from Suddenly Became a Princess One Day, certainly not the look that is similar but like just remind me to jeanette lol
i don't really trust her..it may look kind of sweet like a candy now but who knows that she will put an poison to the second princess right ?
actually after read this there's something that make me confuse... from the manhwa that she read it should be that her father didn't really fond of her after they found out about that she didn't have magic (or so i though ?) and it looks like her father more adore the first bitch princess
but... as we saw he completly ignore and act cold to the first princess so it confuse me a bit that how can he change just in short time without she do something that can make him adore her more than the first bitch princess ???