Ten years ago, Li Changge and her younger sister, Li Changle, were separated. Li Changle was adopted by Shen Wanshan, a wealthy merchant from Jiangnan, and was renamed Shen Mingzhu, becoming the sole heir of the Shen family. Meanwhile, her sister Li Changge founded the Tianxia Chamber of Commerce and became the richest person in the Great Xia Empire. A decade later, Li Changge tracks down her sister’s whereabouts, only to hear that the Shen family has undergone a sudden change. Shen Wanshan has passed away, and Shen Mingzhu is missing and presumed dead. Li Changge soon discovers that this tragedy is linked to Shen Mingzhu’s husband, Xue Renmei, and Shen Wanshan’s concubine, Lu Jinxiu. In order to uncover the truth, Li Changge disguises herself as Shen Mingzhu and returns to the Shen family.