Spoiler
The ML is Arno the count who's her fiance.
BIG SPOILER:
In the end of the novel the prince (after 'returning' to the court as a rightful ruler) inprisons her (or there was something like that). He was really possesive of her and she was locked up and wasted her life with the passing of the days - she wanted to die. She is later 'rescued' and taken care for, and at the "end" of the end she tells the count she loves him (he told her much earlier, but she didn't believe him at that time).
In my opinion the ending is a bit of a mind mess - because the MC switches between worlds and her feelings, and the count loved the 'director' not the 'real' Louisa, so when the 'real' came back to her body all hell broke loose. It was hard to translate and understand what was really happening sometimes, as there are a lot of 'internal' monologues. But overall it's a nice piece to read, but still hard to grasp for non korean readers.

I read from people who read the novel said that it was boring