The King, Octavian Shiron and the Queen Callie Shiron were unable to have children. Soon after their marriage they came to find Callie was infertile but the royal court didn't allow a marriage since they had only been married for a year and didn't want to hurt the royal image, so instead, they thought of picking a peasant girl who looked like the queen to have the children of the king

You had been dragged away from your family and taken to the royal palace to meet the king himself