My Elevator Opens Into an Ancient Empire

Betrayed by her fiancé and surrounded by greedy relatives, an heiress discovers her family elevator leads to an ancient dynasty. There, she meets a disgraced prince fighting for survival. Agreeing to a fake marriage, she uses modern supplies and strategy to help him crush his enemies and claim the throne, while genuine love blooms between them. But when the portal malfunctions and enemies close in on both worlds, can their bond survive the divide of a thousand years?