Modern university student Xia Liqian transmigrates into a novel and becomes Princess Zhaoyang, who is destined to die a tragic death. To escape revenge from the hostage prince, Pei Zhiyu, she changes her usual ways and secretly treats him with kindness and protects him. From helping him out of trouble at a palace banquet, to evading an assassination at a temple and resolving a crisis at the academy, the two gradually fall in love while testing each other's intentions. She unexpectedly encounters her younger cousin, who has also transmigrated into the book, and together they search for clues and join forces against the conspiracies of the Imperial Noble Consort and the enemy nation's prince. After enduring the dangers of the autumn hunt, Pei Zhiyu finally lets go of his obsession with fighting for the throne. Following the suppression of a rebellion, he ascends the throne and marries Xia Liqian as his empress, weaving a sweet romance and political intrigue into a story of mutual salvation.