Poorly Written?

I found this manwha hard to follow-- in that the story was flowing too fast and not much was explained, on top of the characters seeming somewhat puzzling (and not in a good or interesting way). I thought maybe something was off with the translation, but reading the translated novel didn't make it any better. I don't know if it is simply the case of the translation being bad (sometimes, the ones who pick up the work are not good at it, but they're doing it for free, so I won't complain because if I really wanted, I could have just gone and learn Korean myself) or the original writing itself was lacking. There are too many logic holes for the characters (even if you want to say they are eccentric, it doesn't mean their logic or intelligence should suffer as a result), such as how Perse (I think that's the correct name... the translation keeps switching the spelling around) immediately assumes Ciel is an assassin just because she knocked his wine glass (like, you're a duke who has fought, led troops, etc... in what universe does that action = assassination attempt?). Ciel's logic seems rather broken too, which can be excused as her child-brain is messing up her thinking (google about difference between children and adult brains, it's fascinating), but it is much too inconsistent because you have instances of where she thinks like an adult. Does anyone find anything different from how I'm interpreting the story flow and character-build?