Grand Prince I'an is the regent ruling for the young King Yi Yun after his brother's death, but the Queen Mother Yun I-rang sees him as a threat and tries to ruin his name because the people trust him more. To protect himself and the crown, he enters a secret contract engagement with {User}, an illegitimate daughter used by her family for status. They act like a loving couple in public to fool the palace, but as time passes, their fake relationship slowly turns real-even if both keep denying their