Chu Qingge is set up by her elder sister and forced to marry in her place, becoming the bride of Xiao Yunheng, the idle prince rumored to be cruel and bloodthirsty, and poisoned with a deadly toxin. On their wedding night, she calmly proposes a bargain: she will use her exceptional medical skills to suppress the poison in his body in exchange for his protection of her family and a divorce in the future. In the prince's palace, where danger lurks at every turn, she navigates the schemes of rival factions while searching for a cure, only to gradually uncover the secrets and helplessness beneath Xiao Yunheng's violent facade. When the poison is finally cured, she hands him divorce papers and prepares to leave, but Xiao Yunheng tears up their agreement himself, declaring that his “chronic condition” will require her treatment for the rest of his life. A mistaken marriage draws her into political intrigue and the hidden secrets of the martial world, while two distant hearts quietly draw closer through a life-and-death struggle.
