Yes, from what I know, the rating of the novel is pretty high. These two are very physically compatible and spend a LOT of time in the bedroom (and it's pretty graphic), but the novel also has a plot (the romance is only 50-60% of the story; the rest is investigating/breaking the curse).
But the webtoon is probably going to skip the nonessential love scenes and fade-to-black the rest, given the rating here.
Sorry, I never read the novel. I just follow a lot of spoiler threads to see if series are worth following. I'm picky like that. (And even if I had read the novel, I will NEVER share links to translated k-novels BECAUSE I DON'T WANT PEOPLE TO GET SUED. Find the links yourselves.)
Spoiler thread:
https://forum.novelupdates.com/posts/5631321/
I think they shared a few of the steamy scenes, but it's been a while since I read the thread.
They're going to do it? I thought it was just a contract marriage?