This is my first review, but I felt like I had to give my two cents on this drama.
The story itself is very interesting and unlike anything I've ever seen before. It's a good story, and I would've thoroughly enjoyed it if it had stayed nice and cheery throughout the whole series. However, it took a dark and depressing turn when the brothers started fighting for the throne. That part was rushed, unpleasant, and not well-thought out, nor filmed, in my opinion. This is not for you if you want a drama like Rookie Historian Goo Hae-Ryung. THIS DRAMA IS LIKE ROOKIE HISTORIAN GOO HAE-RYUNG AT THE BEGINNING AND TURNS INTO KINGDOM HALFWAY THROUGH.
This drama is not for you if you like happy and satisfying endings (which I do). It was sad and not at all satisfying.
The music was really good though, one of my favourite things in this drama, I would totally download the OST.