This show is crazy in a very good way. I was addicted from the first minute. I loved some characters and absolutely detested others. The plot twisted and turned and twisted again until I was dizzy, and I have to give major props to the screenwriter for setting out to write this outrageous story and sticking to her guns the entire way through, I really appreciated the way writer-nim kept all story threads firmly in her grip and kept the story tightly woven from episode to episode, truly an amazing feat.

The cast is what really makes this show (in addition to the writing) What an accomplished group of actors every single one. I must give special mention to Shin Sung Rok; his portrayal of Emperor Lee Hyuk left me hating him one minute and shedding tears of compassion the next, he was in turn villainous and adorable and his is such a masterful feat of acting that my overall impression of him was sympathetic despite his reprehensible behaviour, he literally made the show for me.
Jang Na Ra and Choi Jin Hyuk also brought some excellent acting chops. Jang Na Ra is a firm favourite of mine as she always delivers a well rounded, evocative performance.
The young actress Oh Ah Rin who plays Princess Ah Ri also deserves a mention as she put in an impressive performance, she elicited tears and laughter which is admirable coming from such a young actress.

The music is great, I loved the songs when they played and they were well suited to the action on screen.

This next paragraph is a spoiler for those who haven't watched the show.

The one criticism I have is the way the show handled Choi Jin Hyuk's exit from the show due to a scheduling conflict, he was unable to film the final episodes as the show was extended and he had scheduled other work. His character of Na Wang Shin / Chun Woo Bin is very central to the plot in this show, so I feel like even though they had to scramble to find a solution, they should have had some of the characters (especially Sunny) actively remember him and even visit his grave to reminisce in the final episode. This was a glaring hole in the final resolution of the show and left me feeling disappointed, it's as if he never existed.
Also show tried too hard to force a possible love line between Lee Hyuk and Sunny, it really wasn't necessary; the show didn't need romance in my opinion because there was so much other stuff going on.

Overall this is an excellently crafted roller coaster of a show with an accomplished cast; definitely well worth a watch.

9 out of 10.