The Great Marshal Mansion's ninth concubine, Shen Jiuer, is usually lazy and naive, indulging in nail art, boat rides, and card games. She has never won a card game in three years and is regarded as a useless vase. External rival Gu Yan uses cheating tricks to seize eight casinos from the Great Marshal Mansion and threatens the livelihoods of thousands of staff, forcing the mansion to send personnel to participate in the gambling duel. Everyone protects Shen Jiuer, but she is actually the successor of a gambling technique family and decides to step up to the gambling table. She pretends to be ignorant and weak, exposes Gu Yan's cheating methods, and after eight rounds of life-and-death games, finally wins back all the industries. After the storm subsides, Shen Jiuer is unwilling to manage the business, hands the family business over to her sisters, and continues to live at ease, protecting her family.