Ghost was amazing.
I believed that Maou was the original version and The Devil the remake... That's why I started Maou, which I had completely disliked. In my opinion the plot was great but it was poorly executed. Maybe I'll add The Devil in my Plan to Watch List.
The Princess' Man
+ Hidden identity (starts as a naive game)
+ Tragic events
+ Forbidden Love
+ Historical
+ Memorable couple
- The story begins when the characters are already adults, they haven't met before.
- Unlike some dramas suggested above, the main genre of the drama is romance. There is also politics but everything is focused on the main love story. Maybe Ghost can provide something different.
-- Edited:
I recently watched the movie
The Palace. There are misundertandings and a stealed/hidden identity. You can read my review of the movie if you're interested ;) I liked it but don't watch it just for the shock factor because ._
that happens towards the end of the movie and isn't as big as it should be._ but instead watch it for it's love story.