The legitimate daughter of the prime minister's residence has feigned physical weakness and illness for years. On the eve of her grand wedding, she suffers the public annulment of her engagement by her fiancé, only to receive an imperial decree bestowing her in marriage to the crown prince. On their wedding night, facing an assassination attempt, she reveals the skills she has hidden for years to save the crown prince. Seeing through the undercurrents of the imperial court, the two choose to form an alliance, joining hands to face the myriad schemes of the inner palace and the court, clearing away the fog of past events, supporting each other amidst the turbulence, and writing a brand-new chapter of their lives.