I read some other reviews that said it gets dragged and I have to agree! It gets dragged to the point you want to drop it. I personally dropped it for almost a month and decided to finish it today because I had 5 episodes left. I managed to finish it because I put the speed on 1.5x otherwise I would have dropped it completely.

I'm actually dissapointed because I was excited about this drama from the 1st episode. The story is good but 20 episodes are too much, there are many fillers with some side characters, I personally wanted more romance between the main leads I would love more scenes of their "forbiden love". There are also many scenes that are in slow motion which gets annoying.
I really like Rowoon and Eunbin and their chemistry was good but I left with the feeling I didn't see much together. Eunbin's acting was excellent btw.

Overall only the first and last 3 episodes are the best but if you like historical dramas you might like all episodes, it's not a bad drama.