Princess Songhwa (Shim Eun-Kyung) refuses her fate of marrying someone who matches her marital harmony. There are 4 men on her future husband list with different fate signs. Refusing her fate, she decides to leave the palace and find her husband by herself.
Seo Do-Yoon (Lee Seung-Gi) is a person who interprets marital harmony signs. He is very skilled at his craft and, consequently, selected as the one to read the marital harmony signs between Princess Songhwa and the 4 men on her husband list.