It was really enjoyable. Yeo Jin Goo was amazing in differentiating his acting for the real king vs the clown vs the clown playing the king. I love Lee Se Young's subtle performance too, she's really fit playing royal women as seen in both here and the Red Sleeve. Kim Sang Kyung and the actors for the villains are also enjoyable.
I think some people who were drawn to watching the drama because of Jin Goo's double role might be disappointed since the real king died in episode 7, but the plot of the drama plus the acting of the actors should be a good reason enough to continue.