So

I read many comments saying both are, and that they are staying all together or something similar

Ohh, i'm guessing they'll end up in a poly relationship then

So, you gonna read it? I think it‘s really good

You find a lot of spoilers in the comment section about the end game. Some more detailed. For short:

Spoiler!!
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Real endgame in my opinion is Gwen. Yes, Nain has Amon and him in the end but Amon just exist for... Some reason. Gwen and Amon would kill each other if it wasn't for Nain though, but with other motives behind it. Amon because of dragon stuff and Gwen because he wants to save Nain.

I would recommend to read 'i can see your stats' first for the world building part and understanding. Then the novel from here. Or you wait for each chapter of the manhwa.

Ohhh is the author here the same who made 'I can see your stats'??? I didnt know that lol (￣∇￣")