Song Youning, the illegitimate daughter of the Grand Tutor, was lovingly raised by her elder legitimate sister, Song Jiyue, from childhood. She unexpectedly gains the ability to foresee future fortunes and disasters, discovering that everyone is destined to suffer a tragic fate. Determined to keep her sister safe, Song Youning makes plans from every angle, hoping to change the predetermined tragic destiny of Xie Yu, the illegitimate son of the Marquis of Dingyuan. Living in the marquis's household, Xie Yu has endured years of mistreatment from his stepmother, and it is only thanks to Song Jiyue's help that he gets the opportunity to study. Crown Prince Li Heng falls deeply in love with Song Jiyue, and the two have a daughter together. Before Song Jiyue passes away, she entrusts her daughter to Song Youning's care.