I think since she is a demon she doesn't really know the tidbits of human customs like courting, the significance of the ring finger etc. She must have thought he gave it out of goodwill and friendship, since in a way, she did help him out.
Shes totally ignorant of human customs, she doesnt know what a ring means and likely has trouble reading their expressions. Shes dense as can be. Also its not like shes promised to Eric or anyone else, so shes free to accept something from anyone she wants
When I was asking the question I was kind of just "complaining" about it,, yeah ik that she's a demon,, it's her 1st contract after all & she'll be bound to do things like that again in the futur of she want to keep her job..
I just feel bad for the blond prince
Idk if it already happened but damn why did she accept the blond ML's ring-?
I was right when I was asking him to return quickly to his country damnit i really don't think that he's the ML,, i wouldn't be able to take it if they broke up brudg