Su Baek-hyang, the King's Daughter.

This is the story of Su Baek-hyang, born as the elder daughter of King Mu-ryeong but unable to retain her title of princess due to her ambitious younger sister, Sol-hui. Humble and hard-working, she was taught never to want or to desire beyond what she has, but the fate given to her is one that will affect not only her life and her family's lives, but the entire nation as she struggles to find her place in life and fight for love.