@IceCubed
That's how shoujo and romance manga in general work. People love reading about people madly in love. In this case, it's a handsome prince who didn't like anyone else before chasing after the main character. He'll win over the main character, there'll be some drama, but they'll overcome...
@Kagamimocchi "Ore TUEEEE" is a meme. It means "I'm strong" and it's used to mock works with overpowered protagonists that never face any challenge, it's kind of close in use to Mary Sue.
@Doomer, yes, "noble villainesses" are shoujo isekai trope, they've been a thing for a while in WNs. They keep reusing this trope even if supposed villainess isn't evil at all. It's fun though, so who cares.
@Chet31, it's a rural dialect thing, most likely Ibaraki-ben, judging by "dappe". If you've played Danganronpa, Yasuhiro Hagakure has the same "dabe" tick, which seems to be common to many dialects. It doesn't really mean anything, it's like "desu"/"desho".