I, a Concubine, Will Marry a Domineering Prince on Behalf of My Sister-In-Law After I Return from Studying Medicine?

[Ancient saying] Bai Jiaojiao, the concubine of the Bai family, was taken away by a mysterious traveling doctor when she was young. She returned home many years later to marry the notorious Prince Jingbei for her eldest sister? ! Marry her! This is the Jingbei Prince's Palace to marry! The notorious prince actually obeyed the tricks of a little concubine? Concept: A meaningless love story