Wei Zhang, a modern infrastructure engineer, accidentally traveled back in time to the reign of Renzong in the Northern Song Dynasty and was granted the title of Marquis. He witnessed the abuses of the salt administration and the hardships of the people's livelihood at that time. He relied on the infrastructure construction techniques of later generations that he had mastered to improve the salt production process, clear the official roads for transporting salt, and gradually rectify the salt administration system. He worked with the emperors and ministers of the DPRK and the country, and together they swept away the salt affairs, making the people of the Song Dynasty prosperous and the country increasingly prosperous.
