Song Ran is a princess stationed in a border town who falls in love with a young general from an enemy country. However, due to the emperor's fear of his family's power, he was imprisoned in the capital as a hostage and betrothed to his apparently peaceful younger brother Chen Chaobai.
Because of her impression of Chen Chaobai when she was young, Song Ran believed that Chen Chaobai was ambitious and only married her for military power.
After entering Beijing, he made many attempts to break off the engagement, but was resolved by the male protagonist.