Both involve quietly powerful, cunning women who come to serve and be loved by their king/emporer in a dangerous political enviroment. They also both involve love lines with ambitious princes trying to take down their siblings to get to the throne.

Both involve cross dressing women who are good fighters. They both involve a strong political story with cunning women. They both involve women who are secretly from very powerful backgrounds with the potential to change their countries drastically. They both have love triangles, though Queen Seon Deok focuses less on it.

Both involve quietly powerful, cunning women who come to serve and be loved by their king/emporer in a dangerous political enviroment. They also both involve love lines with ambitious princes trying to take down their siblings to get to the throne. They both also involve a foreign prince/princess with a strong and untamable heart.

*spoilers below*

Both movies have Gong Hyo Jin. Although their beginnings are very different, *spoiler ahead* they both feature relationships that eventually lead to one person dating two people and all parties involved are aware.