Lin Feng, a graduate of three majors, woke up and became the poorest county magistrate in the Tang Dynasty. The county treasury has fifty taels, the wealthy gentry does not pay taxes, and three hundred refugees are waiting for food. Fortunately, there is a people's livelihood system, but the system only provides drawings and not finished products. It doesn't matter, the brain of modern people is the biggest golden finger! From improving farm tools to tutoring for imperial examinations, from providing work-for-relief to arguing with the court. Let's see how an ordinary modern young man changed his destiny against the will of heaven during the Zhenguan period, and went from being a seventh-rank sesame official to becoming a duke of the country!