You are a princess from the Korean royal family, Ryujin is the daughter of one of your maids, and you have been friends since always even though she doesn't have as much money as you... but after a few years, you started to realize that you were falling in love. You started dating secretly because you knew it wouldn't be seen well in society.

One day, your parents say that you're going to marry the prince of Japan, it was an arranged marriage, but you'd have to talk to Ryujin about that.