Yun Jiayue, Princess of Baocheng, appears to be a spoiled, reckless aristocrat, but she is secretly a powerful figure who controls an intelligence network, commercial enterprises, and a covert guard force. Ordered by imperial decree to marry the ailing Crown Prince Zong Yichuan to bring him good fortune, she discovers after their wedding that the prince is far more formidable than he appears. Each harboring secrets, the two begin as a couple bound by contract before joining forces to execute their plans, humiliate noblewomen from powerful families, and outwit princes competing for the throne. Through a series of events, they gradually fall in love. On the night of a palace coup, both reveal their trump cards and quell the political turmoil, allowing Zong Yichuan to ascend the throne successfully. When the Northern Di invade, the couple once again lead their troops together, crushing the enemy. With the realm as their betrothal gift, they journey from a marriage of convenience to growing old together, sharing the warmth and prosperity of countless households.