Just finished watching it. Really amazing drama, and honestly, I didn't expect it to be so in the beginning, because of the romance Romeo & Julie premise. Exceeded expectations, 10/10. For once I actually loved all of the cast members (at least the important ones). Park Shi Hoo is, well, perfect anyway, but the female lead was also great in this part, and the chemistry between them was really working. I especially like how all the characters grow with the development of the story, and you get to see it in a non forceful- verbal way, as it happens sometimes.
Absolutely loved it, cried buckets, but don't worry, this is not a spoiler. Find me a serious historical drama where you didn't.