Xiao Qingxue is the most honored eldest princess of the Kingdom of Nanzhao. She commands the kingdom's entire military and owns trading houses throughout the Central Plains. Three years ago, she concealed her identity and came to the Great Yong Dynasty, disguising herself as a female physician. She saved Pei Ziyan, the Prince of Jin of Great Yong, and secretly helped him ascend to the position of Crown Prince. Yet on the very day he became Crown Prince, Xiao Qingxue was demoted from his wife to a concubine, while Pei Ziyan appointed Yun Xueyao as his Crown Princess. Pei Ziyan feels no remorse for his ingratitude. Instead, he accuses Xiao Qingxue of being petty and lacking consideration, claiming that her lowly status as a female physician makes becoming his concubine an honor she should be grateful for. The nobles and officials of the entire court mock Xiao Qingxue for being greedy and overreaching. Adapted from the Tomato Novel "Demoting My Wife to a Concubine? One Hundred Thousand Iron Cavalry Kneel to Welcome My Ascension", by Lu Minghuang.