(Spoiler)
I read the latest raws and I don't think blonde priest is endgame. They're just having a spicy moment. MC was actually thinking about the horned guy before the priest went at it. Nothing is confirmed because the raws are still getting updated.
I completely agree with you. Fantasy BL really likes the trope of a small pretty top and buff bottom, which is fine but man this trope is everywhere in fantasy BL... I think the demon is the perfect choice for endgame, or even just have the priest and the demon be end game together! But it's so boring to have the small pretty priest to be the main ML... I much prefer buff seme x buff uke.
I was interested in reading this manhwa, mainly because of the cover featuring that long haired demon. I even read up to Chapter 10 and now the comments be telling me that blonde haired priest(?) might possibly be the endgame? Like broooo, imo, pretty boi seme/unexpected seme x manly ukes are so common in manhwas, especially in supernatural ones. it makes me want to read something with a buff seme x buff uke (something like Shutline, but this topic is for a different day) Anyways, unless, long haired demon, becomes the endgame, Imma leave this on want to read ╮(￣▽￣)╭