After a fatal accident, Sia is transported into a historical drama as the baby princess of a lowly concubine. All she wants is to live peacefully with her new mother, but Sia's strength and intelligence gain her the favor of the crown prince and the king. Soon, she becomes a pawn in the hotly contested selection of the new queen. With the competing head concubines and their sons using her in their race to the throne, can baby Sia save herself from falling prey to this royal charade?