Had the same problem all sageuks tend to have: a bad villain. And there was a HUGE plot hole that I don't understand why it wasn't addressed ([spoiler]the Byeokcheon survivors not taking revenge on the people *actually* responsible for the destruction of their homes and the murdering of their friends and family, aka Jo Won Bo and the rest of his cronies. Instead, they targeted and murdered innocent people, which didn't sit well with me.[/spoiler])

Other than that, there was a *sort* of love triangle that wasn't ever really a love triangle at all since there was quite little romance going on (except for some light flirting and a couple of hugs and catch-you-so-you-don't-fall situations). But I really liked both lead characters: Jae Yi was super badass and resourceful and the Prince was a slow-witted genius, who was equal parts arrogant and soft boi.

The second couple was also good and had a fun dynamic together.

I really enjoyed the first four or five episodes, but after that, it turned into kind of a "meh" show. Maybe it would have been better in a typical 16-episodes format.