Shen Yufu, the second young lady of the Shen family, marries Xiao Shuo, the Fifth Prince, who has been lying low due to a leg injury. On their wedding night, she proposes an arrangement in which they become substitutes for each other. As they spend time together, genuine feelings gradually develop between them. Shen Yufu discovers that both Xiao Shuo's leg injury and the death of his mother, the late Empress, were caused by the Empress. Divine Physician Xue treats Xiao Shuo and cures his leg. The Empress and the Crown Prince repeatedly devise deadly schemes, but each is thwarted. Working with her elder sister, Shen Miaosen, Shen Yufu gathers evidence and exposes the Crown Prince's rebellion and the Empress's poisoning plot at the Emperor's birthday banquet. In the end, the villains are brought to justice, Xiao Shuo is appointed Crown Prince, and the couple finally finds their happy ending.