The Empress (Myung Se Bin) is in her early 30s, but she is still not married. Since, the 1st successor to the throne died, the royal family is in search for a new successor. Incidentally, they come to know of a young man who was in fact a son of the prince to a woman who left the Palace for her to be able to keep her pregnancy a secret. The young man's name was Lee Hoo (Se7en), more commonly known to his friends as Kang Hoo. Lee Hoo worked as a delivery boy at a Chinese restaurant, and was known for his 7-minute maximum delivery time. Lee Hoo had been brought up as more of a punk than a prince so his habits and his way of conversing were very different from the people of royal blood. Although he had never dreamt of living in the Palace, he one day finds himself immersing himself in its grandeur and improving himself to prove that he indeed deserves to be called the Successor to the throne.He soon finds out that not only will he be facing lessons to the path of royalty, and dilemmas of love and of stature, but he will also learn to compete for the position he had been, first and foremostly, called for.

Hana is a bright young girl who lost her father at a young age. When her mother returns to Japan, she comes with her new Korean husband and his son Yunsuh. Yunsuh’s mother died during his 10th birthday and after her death, he becomes autistic. While Hana is fond of her new step-brother, he wants nothing to do with her. When their parents leave on their honeymoon, Hana’s mother leaves the children with her deceased husband’s sister who will manage their inn during the trip. While they are gone, the aunt and her daughter Maya abuse Hana and make plans to sell the inn in order to pay for gambling debts and college. Despite all of this, Hana finds comfort in her brother who begins to open up to her and eventually speaks after his 20th Birthday and the day his mother passed away. Yunsush's mother died on the same day as he was turning 10, 10 years ago. As they start to have feelings for one another, Hana is afraid to love him. She soon leaves with her "senpai", Fujiwara Ryu, who also likes her. Later on, Maya gets jealous, and decides to make Hana's life even more miserable.