I have watched a number of korean historical drama but so far, I feel like this is the best one. The romance was ok only so don't expect much from there. Go Ara started out as a feisty character and halfway she sort of faded away and somehow "lost her voice".
Other than that, the main storyline was really good and it made me go read up on the main character in real life. Every episode kept me on my toes and I loved how the people around the king helped him. Jung Il Woo really does a good job here and his character is really likeable as he displays courage in the midst of adversity.