Shi Ruan transmigrated into "The Black-Bellied Prince's Moonlight" as the true daughter crown prince consort whom everyone despised. Possessing a medical system, innate divine strength, and foresight of the plot, she knew Crown Prince Xiao Leng was destined to die young, while the fourth prince was the future emperor. Seeking self-preservation, she single-mindedly wanted a divorce to remarry and cling to the fourth prince's thigh. However, her inner voice happened to be heard by the crown prince—wanting to run away and complaining that the crown prince would die young were all heard loud and clear. From being so angry his face turned green to discovering this crown prince consort was "damned sweet," Xiao Leng pampered her to the heavens step by step. Not only did Shi Ruan fail to run away, but instead she helped Xiao Leng defy the heavens and change his fate, ultimately becoming the mistress of the Central Palace and mother of the nation.