KingC

I wondered the same thing, but then in one of the last few episodes, Ma Go mentioned that the manager of Hotel Del Luna, who drinks the wine, loses his/her human form and instead has their soul chained to the tree. (Indirectly the tree is them.) Which was exactly Man Weol's punishment for her crimes.

From the trailer, (and the recent preview), I thought that Dan would go back to paradise and Yeon Seo would continue her life as a ballerina. Unless, she remembers everything that happened. Or the writer will go for an ending like the one mentioned by you, or, worse, end the show like how she realizes that her true love is ballet. :D
Or that Dan turns to dust. Anything is possible. But, they better tie up the loose ends. (Like Ms. Jung, Art director, Ni Na.) So far their stories make me want to keep watching. But, the ending...

This drama seems to be leading towards a predictable ending. Its actually sad, cause it has lots of potential to end happily. I really hope the writers prove me wrong. Dropping this one for a while until the final episode airs.