The Sword with No Name (2009)

A movie depicting Heungseon Daewongun years later after he has put his son on the throne.
The story follows his son's wife "Empress Min" (a boss bitch queen?) and how Daewongun tries to get rid of her with the help of Japanese when she starts getting in his way.
It shows what happens to his son and his generation line in the following years as he sees them becoming puppets under Japanese rule.
P.S many historians say that it was Daewongun's fault that Korea went under Japan....

They both admire the queen and are willing to do everything for their love.

Both have this dramatic feel about them
Intense sacrificial love between the leads
both around the era when japan invaded Korea
cool sword fights
"warrior gives everything to protect the girl"
although note that the movie was made in 2009 so give the direction/production a pass