I'm loving this drama to bits. Everything about it is good: the story, the cinematography, the cast...
The story and its characters are quite original (this is historical fantasy after all), but all of them blend together very well and you will be immersed in their world in no time. The female lead is an icon for strength and independence, and the male lead is sweet and soft but has also shown that he has a lot of potential as a king (if we add how handsome is CEW, you have the perfect combination for swooning non-stop over the prince)...they are super-cute and will make your heart flutter with their scenes together.
I also love that there are strong bromances and sismance going on. This drama is full of adorable and righteous characters and you will be rooting for all of them in no time. Fortunately the bad guys are minority and I expect they will be overruled soon.
It's also nice that apart from all the romance, fluff and comedy, the drama is tackling more serious topics, like science, education, politics and even the anti-vaccine movement. I find it very entertaining and a perfect summer watch. :)