I started watching this drama because I was intrigued by the idea of body swap, and it turned out to be a nice funny story.  
That was until the last couple of episodes happened. It felt like the writer of this show just had a sudden idea at the end of making this story and they wanted to insert it no matter what, or just had the idea all along and couldn't mix it well with the rest of the plot. Either way, it is didn't work out and they were a lot of plot holes and unanswered questions. Also, the relationship between the princess and the other man bothered me.
But I'm going to look over all that since I'd enjoyed almost everything about this drama and don't want to ruin the experience. Besides, episode 20 went back to original funny vibes of the show and it was really entertaining. I'd love to see more about Ji Man and Da Xi.

Recommended if you want to watch a (mostly) lighthearted drama with a lot of funny moments.