I don't know why so many people rated it so low. It is very interesting, absorbing and exciting drama. Even it had 50 episode and I didn't like its ending but throughout the whole series, the story was so good that I watched it twice already. From the begining to the end I can't see any problem except for the last episode. Amasing plot, good costum, very well acting, a lot of good actors, so much chemistry, and very good music.
The only cons of this drama was its last episode. Even though some how it was counted as a happy ending (between ML and FL) but there were so many death at the end which some were really unnecessay among the important characters of the drama. Not mentioning the unnecessary scene for the fall of ML to then bring him back out of nowhere. So the only and only reason I won't give this drama 10 score is those death that were not really necessary and even were cause a break to the logic of this drama. Otherwise it is worth watching it and even the last episode don't make me regret it even a bit. Also, because it wasn't a bad ending for the Leads I've watched it twice.