Jacob Frye:
Thanks, I will check it out. Do you know of any dramas with the same theme?
If you like to watch a story about a queen, or princess, who must be a dutiful wife to her royal (intended) husband, but chooses her heart in stead, I know another movie with the same theme: A Frozen Flower, here the queen falls in love with a loyal general of her homosexual husband. Very mature movie BTW.
I can't find any drama with exactly the same theme, only three series partly fitting the bill:
The Princess' Man is about a princess whose father wants to be king, but she falls in love with the son of her father's mortal enemy
In Ja Myung Go a crown princess is blinded by love for a prince who conquers not only her heart, but also her country. The prince's real love is her sister, but this sister fights him until the end.
Empress Ki is a real classic about warrior woman Ki who is loved by the king of Goryeo, and she loves him back, but she ends up as one of the war prize women for the powerful Mongol emperor who finally makes her his empress.