The main female protagonist. She was an orphan who was taken in by Beck-Ja. Sei-Ann isn't her real name. When a prince came to the castle of Beck-Ja to attend a party, Sei-Ann got the idea of getting married to the Prince so she can leave her life of being a servant. She made a deal with Sian, a young man who Sei-Ann thought was a servant. The deal was for her to get closer to Prince Joon. Somehow her family is related to the royal family. She comes from the royal house called 'Antoweif'. All of the people whom were related to the house of Antoweif were executed for a horrible crime, everyone except Sei-Ann.As of the manga chapters she was revealed to be the remaining heir of the Antonweif's and is engaged to the Crown Prince Sian, liked by Prince Joon and still teased by Prince Yu-Jen to marry him.