As a humble court lady, she harbored a deep longing for the Crown Prince. However, as if to rebuke her feelings, a piece of red charcoal thrown by the prince grazed her cheek, leaving an indelible scar on both her body and soul. Six years later, Yeon-woo receives a secret summons from the Empress. 'Act as me, the Empress, and receive His Majesty's royal favor for a single night.' It is just one night. Exactly one night. If she becomes a fake Empress and receives proxy royal favor from the Crown Prince-turned-Emperor, everything could change.