The plot is not perfect and it has up and down moments but overall, despite a few clichés, it's innovative and well written. From a light mystery romance it turned into something deeper and melancholy, but without giving up a few moments of comedy. I loved the whole idea about angels who fall in love but the mystery part about the villains was a bit too draggy maybe less "drama" and 12 episodes were enough to close the story.

The great performance of the cast brought on the screen all this deep emotions, portraying perfectly their roles and the story. I never been a fan of Shin Hye Sun but her performance was brilliant, also "L" for being a newbie did a really good job, specially considering that his rival on screen was Lee Dong Gun. The rest of the cast was also great considering the overall quality of the screenplay they had to perform.

I also never been a fan of ballet but I loved it in this drama, the theme of ballet has expressed perfectly the main theme, love can be beautiful and powerful but also hard to accomplish and sad.
The ending also fit perfectly with the message of the drama, truly love someone means being able to sacrifice ourself to those we love, but the sacrifice will be repaid. I am not a believer but I think it is an adequate ending also in religious terms, since the drama is about angels and deity's plan after all.

I can't say this is a perferct drama but it deserved to be watch, if you can overcome a few draggy moments it can gives you a beautiful love-story and tons of emotions. Besides the soundtrack is wonderful!