After the fall of Great Yan, Su Mian, the legitimate princess, is captured and brought into the palace by Chu Junqi, the former hostage prince who has become the new emperor of Chu. Once a princess of noble birth, she is reduced to his personal maid. Convinced that she once poisoned and betrayed him, Chu Junqi subjects her to endless humiliation in the name of revenge. Meanwhile, as Su Mian struggles to escape, navigate palace intrigues, and rescue her father and brothers, she gradually uncovers the truth: Wen Yi intercepted letters and stole credit for their achievements, while Prince Li, Chu Moli, used a love-afflicting poison to manipulate her. Amid their tangled love and hatred, Su Mian eventually becomes a princess of Xuanyuan. Chu Junqi follows her there under the identity of Chu Moli, marrying into the Xuanyuan royal family. At last, the two resolve their misunderstandings and rekindle their marriage.