The core story of this drama is about tracking down the mastermind behind the kidnapping of the "unique magic medicine" ten years ago. It tells the story of Su Mo, a concubine's daughter in a marquis's mansion who is bound by feudal marriage, and Shen Yu, who was framed and forced to marry for her sister, who accidentally become "sister-in-law" and work together to face multiple difficulties. It is a story of a pair of happy enemies who gain love and growth.