If you are watching this drama because of Queen Seon deok show, I think it's better to pass on this one, or if you want to watch this drama, I only watch the parts when it's about the 2 main characters Kim Chun-Chu and Kim Yushin.
Most of the episodes in and I find myself bored fast forward watching to the next episode, there is retelling of Queen Seon deok story which I find it unnecessary, the show I feel would have work better if the focus was on Kim Chun-Chu's story and remove some of the filler episodes it would have much better pacing and story in addition to there are too many supporting characters taking up the screen time with their own stories that I'm not interested in. The costume and make up in the show look really great on screen but some look out of place considering it is a historical drama based on actual history.

Acting: the main lead actors performance are not as good as I have seen them from other show like Dong yi, Dae Jo Yeong. While most (almost all) of the actors playing the role of the antagonists, their acting are terrible and hilarious because of the overacting.

In conclusion, its a disappointing drama because of the potential and that is just style over substance.