Lin Huan Huan and Lin Shang Shang are twins. The younger sister, Huan Huan, was sent up to the mountains to learn medical skills since she was a child. Years later, her sister Shang Shang fell in love with the Crown Prince. Unexpectedly, the Empress deliberately bestowed Shang Shang a marriage to Prince Shangguan Li, for which Lin Shang Shang hanged herself. Lin Huan Huan now is forced to marry on behalf of her sister, starting a life of cohabitation between enemies!(Source: Westley at Dramacool)