Seukhye is an orphan girl who meets Son Joohee while working at a hospital cleaning. Son Joohee turns out to be a princess who has been diagnosed with a terminal illness. She has lied to her family telling them that she went on a vacation and asks Seukhye to take her place once she dies. 
Seukhye is then thrown into the luxurious life of a Korean princess and must learn to face her knew life, especially when she meets the cold Chinese Prince Zhang Yixing.