First 10 Episodes are good (9/10) and then its get muddy and dragged down

Lee Sueng-gi does well to keep the show interesting till the end. Radiant and expressive eyes ; he shows all emotions in Royal style
Ha Ji-won does a better job here and is actually bearable comparable to her character in Secret Garden.
[spoiler]Both are quite similar roles but in Secret Garden she turns to a meek,crying damsel after 2 episodes while here she still is badass till the end ; true to her original role [/spoiler]
Yoon Je-moon is the reason i rate the show the low ; his performance desires more for a villian.

[spoiler]The second pair are forgettable and like most K-dramas they have a forgettable ending too [/spoiler]

Overall this show has same vibe as CrashLandingonYou which release 8 years later.