I will keep it short.
It's a short drama but they haven't compromised with the settings or the costume or any aspects that could hinder the enjoyment. As mentioned it is character-driven but that doesn't mean the plot is illogical. The conflict is external but the central conflict is centred on the characters.
They set up the world nicely in the first few eps and establish the characters. From there onwards, it is the characters actions and motivations that drive it forward.

The main couple is already married but they also shows how they fell in love, which was really sweet for me. The Cp have the typical love-hate part which brings the conflict in their relationship but we come to root for them as well. Princess Bai Zho is such a sweet heart. They have kept only what is necessary so the eps doesn't feel too much of filler though they are still light hearted. The main couple's affection for each other was really touching.
Except for the open ending, this was really well done drama that deserves attention.