The legitimate eldest daughter refuses to marry Prince Jing, who is rumored to be seriously ill and paralyzed, and flees on the eve of the wedding. In the ensuing chaos, she, a daughter born to a concubine, is forced by her family to take her elder sister's place in the bridal sedan. Everyone expects her to endure a miserable life caring for a crippled husband, but on their wedding night, she discovers to her astonishment that Prince Jing's limbs are perfectly healthy and he was never paralyzed at all. Even more shocking, the prince has known all along that the woman performing the wedding rites tonight is not the legitimate daughter originally intended to marry him.