In the royal court of Joseon, a secret investigation unfolds as Yun, the king's most trusted concubine, is tasked with uncovering the truth behind five concubines who refuse to submit their virginity certificates. To aid in his mission, Yun forms a strategic alliance with Seo Kyung, the court's most skilled merchant, who supplies the concubines with their every need. As they navigate the intricate web of court politics, Yun and Seo Kyung pretend to be a married couple, working together to identify the concubine destined for the throne. With their combined wit and cunning, they embark on a perilous journey to find the future queen, all while hiding their true intentions. This ongoing saga is an unmissable read for fans of historical romance and royal court intrigue, where loyalty, deception, and ambition entwine.