Marquis Dingyuan, Gu Yuanzheng, faked his death in battle, colluded with former dynasty and Eastern Palace factions in an attempt to usurp the throne, and secretly plotted against his lawful wife, Shen Qingtang. Pregnant Shen Qingtang exposed the conspiracy, controlled the marquis mansion step by step, and formed an alliance with the seemingly dissolute Prince Jing, Fu Xuance. She turned old staff in the mansion against him, shattered the plot, and disintegrated Gu Yuanzheng's faction. The decisive battle of Xishan broke out, Gu Yuanzheng's camp was annihilated, and Gu Yuanzheng died of an arrow wound while saving Shen Qingtang. After going through hardships, Shen Qingtang successfully gave birth to her legitimate son. The imperial court rewarded merits, and Shen Qingtang was conferred as a First-Rank Lady of Command. Her son inherited the title of Marquis Dingyuan, and a heaven-shaking treason thus came to an end.