Courtesan Yue Linyan is actually Shen Shuangren, the head of the intelligence organization Shigu Pavilion. To investigate the political intrigue of the salt transport, she sells herself for ten thousand taels of gold to marry the ruthless Prince Lingyuan, Nan Yanxiu, entering into a one-year contractual marriage. She hides her edge to enter the game, while he tests her step by step—from the bridal chamber maneuvering to blocking a blade on a rainy night, and from their identities being exposed to giving their true hearts. Amidst the deadly political chess game, the two shift from mutual scheming to uncontrollable affection, joining hands to tear open the court's dark curtain, and a fatal romance of a powerful duo begins.