I have not watched any of it but I feel it deserves at least one comment. I've been chain-commenting on K-dramas I didn't enjoy with passion (I'm a passionate ranter) and with moderate interest on those I enjoyed (mostly trying to prove unprovable points to a much more discerning audience than I'll ever be).
But this comment is going to be starting a brand new category of comments, entitled: I don't know what this is about but I don't want to hurt the K-drama divinity and be punished by being deprived on dramas in the future.

JCW is the only good thing about this show. He had so much presence in all of his scenes, everyone else is so meh and pribably cast wrong. But also they aren't directed well to act well. This story was also overall meh. I initially liked the premise of having 24 hours to solve this issue setup and also find the killer but turns out they didn't do both well. SPOILER...
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We never find out the killer, the show ends on a cliffhanger and the chosen prince (future king) who I think is liked by the Koreans too was given a weird portrayal. So it was all style no substance. And the style isn't that great either. I do like the story of the historical figures or whenever they tried to embed history and I think a more realistic portrayal of Queen Woo and Na Mu would be very good to watch. They should make more 3 Kingdom dramas, if they have strong leaders for once.

Meh...