Can someone tell me the title?

So I first read it on an app called Wattpad, I dunno if it finally had a physical copy or if it moved to another app, it’s been a while…

So basically from what i remember, it was a story about a woman from the present times who find herself in an old mansion/castle. There, she met a man who does not age or die. He was cursed from what I remember so that’s why he ended up like that. He even made/wrote a book with his skin as the leaves/pages and his blood as the ink. There was a particular scene that I remember where the guy was fascinated by the ballpen the woman used. Other than that, I can’t remember anything else.

It’s a romance/fantasy book that read before on Wattpad. I’ve been looking everywhere but I just can’t find it, I can’t even remember the title.

Spoiler alert!!!!
In the end, the woman also became immortal and she and tge man travelled the world together. I know there’s more to ut but I think I stopped reading or mybe there’s a second book

Please tell me if you know this book! I’ve been dying to find and read it again. Thank you in advance!!

by Amethyst_Roan