The series started out really strong in the first 2 episodes and then somehow lost trajectory and progress in the middle ones so it was really boring and lame to watch. I watched it as it aired so at some point i forgot what the actual story/mystery was about. Other times i struggled to finish an entire episode in one sitting.
Thank goodness the final episodes redeemed it. It could have easily been a 14-16 episode drama with a shorter duration of episodes.. So if you're planning to binge watch it, don't be annoyed that you may lose the enthusiasm you had when you first started.

Park Hyungsik's acting is the only reason i continued watching tbh and is the only thing I'd ask future watchers to look out for. The female character's acting is superficial and fails to evoke emotions. The princess, the young prince, and the 2nd male lead only get scenes when it's necessary and i would have liked to see them bond more with the female character and the crown prince.