Cathy Graham is reborn. In her previous life, the eldest legitimate daughter of the Marquis of Conquest was betrothed by imperial decree to Walter Bradley, the outstanding Third Prince. On the day the decree was announced, Walter rescued her drowning cousin Emma Graham. At the Graham grandmother's instigation, he married both sisters. After Walter ascended the throne, he poisoned Cathy and her unborn child just one day into her reign as empress, and wiped out the entire Graham family. It turned out Emma was a modern time traveler, and everything was a scheme she and Walter had orchestrated. Reborn on the day of the marriage decree, Cathy decisively rejects Walter and chooses Prince Kyle, the capital's most notorious playboy. Little does she know his wastrel persona is merely a facade. The two join forces to rise to power, with Kyle becoming the next emperor.
