I think, it is good that he becomes human once they are together, so they can go to a distant place and grow old together, or who knows, maybe in the end the two by magic end up in Korea together.
Well I understand that point, but I hope they can escape somewhere ...
The fact that she is "empty" may mean that she is still tied to her old home in some way, maybe they can escape there hahahaha (I know, I'm dreaming a lot) I really don't like the characters whose end has "immortal lives included" I always have the feeling that at some point they will run out of love and eventually separate.
Or that she cannot accompany the protagonist and die of old age. Even if she leaves children (like a certain manga that I don't remember the name) I think it's very heartbraking.
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(/TДT)/