The wedding of Shen Wanwan, the daughter-in-law of the Grand Tutor, and Xiao Zhi, the prince of Ning Guohou, are about to take place. Xiao Zhi's childhood sweetheart Zhao Yin'er changes the wedding dress of the main family into a pink wedding dress of the concubine, humiliating the Shen family in public. Xiao Zhi favored Zhao Yin'er and asked Shen Wanwan to give in. Unwilling to be humiliated, Shen Wanwan took advantage of the marriage granted by the emperor to remarry Xiao Zhi's elder brother Xiao Chen, who was stationed at the border, and helped Xiao Chen take his place as the eldest son. Zhao Yin'er suffered the consequences and became an aunt. After Xiao Zhi lost power, he resigned himself to depravity and actually colluded with the second prince to collaborate with Beidi and assassinate Xiao Chen. Shen Wanwan and Xiao Chen used their plan to defeat Beidi and uncovered evidence of the crimes of Xiao Zhi and the second prince. In the end, Xiao Zhi was beheaded and the traitor was brought to justice. The two of them guarded the border and lived a stable life.
