On the day of her grand wedding, Shen Ruojin was betrayed by both her fiancé Pei Jing and her stepsister Mu Yunwei, and publicly remarried the profligate Prince Qin Lang. On their wedding night, her husband abandoned her to save an opera singer, yet she calmly took charge of the estate, bought the opera house, and won at the gambling dens, firmly establishing her footing amidst the Marquis household disputes. When her maternal grandfather, Old General Shen, was trapped at Luoyue Pass with supplies cut off, Shen Ruojin drew her sword and rushed to the western frontier. Qin Lang pursued his wife across a thousand miles, disguised himself to sneak into the Protectorate, and helped her steal the military tally to open the city gates. Transitioning from an alliance of convenience to sharing life and death, the two ultimately became true husband and wife standing side by side against the enemy.