Modern youth Zhang Mu accidentally time-travels to the early Zhenguan era of the Tang Dynasty. At that time, wars had just ceased, the imperial court enforced compulsory marriage and taxation, and villagers fled from marriage one after another. Only Zhang Mu seized the opportunity to marry the exquisitely talented Cao Xianhui, becoming a matrilocal son-in-law of the Cao family. Relying on modern knowledge, he refined white sugar and used ancient papermaking techniques, striking gold step by step. At the same time, he outwitted commercial rivals to solve the Cao family's crisis, astounded Chang'an with poems through the ages, stirred up the imperial court, leveraged to break the bad habit of close-relative marriage, achieved a comeback all the way, grabbed power and influence, amassed wealth, and won the emperor's high regard.