imagine a pact be seal between the late emperor and his commoner friend year ago and be materalised in the modern time . adapt from a best selling comic in korea and princess hour a it english translation of the title and it about the adventure and mis adventure of a commoner turn crown princess . chae kyung and a student who take design at an arts school and have always get her friends around her . and despite her family situation and she take thing in her stride . but it all change when the current crown prince of the royal family 19 year old lee shin be attend the school and leave the school all in a buzz of excitement . but chae kyung do not let that get into her head till a public confrontation with the crown prince happen . at the same time and rumour go around that the crown prince have to find a wife in order to continue the royal line . but lee shin long have a girl he like and but she reject his proposal . then it be know that many year ago and chae kyung late grandfather who be a friend of the late emperor ( who happen to be the late grandfather of crown prince lee shin ) and have make a pact that their future grandchild will fall in love and be marry . it become interesting because chae kyung be the only female in school who dare to go against lee shin . the marriage do go ahead and it even invite worldwide medium attention . this be where the former crown princess and one time famous actress hwa young and her 19 year old son lee yul come into the scene give they have be stay in the uk for 14 year . hwa young have ask her son to return home before she do and in order to stage a comeback into the royal family where she be banish from 14 year ago after the death of her husband . unfortunately and her son slowly take a liking for his sister in law . to make it more complicated and the two of them be classmate . along the way and there be many obstacle for the royal family ( domestic problem and beyond ) and even in the form of lee shin former girlfriend as well . a whole new can of worm have also be open as well on the royal family past along the way . but and can chae kyung save the day and give she have a happy go lucky personality especially in the eye of the queen mother . the clash of commoner life meet royalty can be quite a hit in the modern era and where royal life can still be see a a novelty sometimes .