The story was a mess, the acting was okay at best, and main actress had zero chemistry with both leads.

I've gave this a chance due to the high ratings, and was interested for the first 20 episodes, but after that the plot became ridiculous, the writer focused way too much on pointless cameos and cutesy emperor scenes which ruined the flow and plot direction, and one of the main characters didn't even appear in the last four episodes.

I don't what happened behind the scenes, but the writing completely fell apart. The twist with the grandmother was one of the dumbest reveals in the show. And I am sick and tired of the female characters in kdramas being forced to put up "romantically" with abusive twats. All the scenes with Sunny and emperor made me want to puke. The bodyguard was a "nice guy" but the writing for the character and backstory was so one-dimensional and flat.

Personality wise, the only characters I really enjoyed was the grandmother and Sunny.

Complete waste of time, too many crazy character tropes with no proper resolution. I feel dirty after watching this.
On the bright side, the music was pretty nice.