Lan Ruoxi, the widow of the richest man, was forced into the palace by her clan uncle at her husband's funeral, and had to agree to recruit a son-in-law to keep the inheritance; she set up three cruel examination questions: to recover the robbed official's money, to find out the mole, and to save the dying industry; Shen Yan, a scholar from a poor family, stood out with his extraordinary accounting reasoning ability, but he also attracted a killer; the dandy Gu Yulang used money to pave the way, but the source of his funds Suspicious; the mysterious knight Chu Feng secretly protects Lan Ruoxi, and seems to have a hidden agenda; in the second question, Lan Ruoxi set up a fake account book trap, and the accountant was caught and betrayed the business enemy Liu family; in the third question, Gu Yulang was exposed on the spot for embezzling official money and was expelled, Shen Yan proposed a joint venture plan with the Western Region to bring the silk village back to life; sister Lan Ruoyun was jealous of Shen Yan's affection for her sister. Sowing discord; just as the recruitment of a son-in-law is about to be settled, the imperial court suddenly issued an imperial edict to confiscate the family, and the husband was charged with treason; Lan Ruoxi and Shen Yan teamed up to find her husband's secret account books, revealing that he was silenced after discovering that the prime minister had embezzled military pay; Chu Feng died for his protector on the way to Beijing to file a complaint; he used the power of the three princes to overthrow the prime minister, and the family property was returned; but Gu Yulang colluded with Lan Ruoyun , exposed Shen Yan's identity as the former prince in public; Lan Ruoxi painfully terminated the engagement, and Shen Yan went to northern Xinjiang; Gu Yulang led Beidi to invade, and Lan Ruoxi used Shen Yan's token to rally the rebels and cut off the enemy's food and grass; Shen Yan made meritorious service by capturing the enemy on the battlefield, and his identity was pardoned; in the end, the two got married, and Lan Ruoxi integrated the industry into the North-South Trading Company, achieving the dual perfection of business and love.
