I'm excited too! I need to see the sex scenes in manhwa, there a bunch of them in the novel, it's always so hot ! I love the looks of them, Renslay is such a pretty man, but he's not like too delicate or feminine, which matched with book's descriptions cause he knows how to use a sword and jump from high walls, he has some muscles.
There is no love triangle.This part ahead might have a important spoiler, but here I go:
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Eventually they plan to fake "princess Ivet" (Renslay) death so the duke can marry a person who can get pregnant without exposing Renslay's farse. There are conversations about a new bride for the duke, but we never get to meet this girl. After that, Gisel gets a lot more jealous, cause Renslay is such a social butterfly who has a lot of friends, he likes to spend time at the tavern, and he likes to dance with his girls friends there, but there's never a serious third part between them.
A chimera-like creature.
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In his full creature form Gisel remembers a black lion who flys ( or maybe a black bear), when He's turning back to human form he gets bigger members of the body and he has horns, black scales and long nails. So it's just a slightly monsterfuck. he is in between forms when it happens.

I read the novel and if I can say a tiny little spoiler is this one thing : Renslay fell first , Gisel fell harder . They're such a good couple when they get together. I love them so much.