Lu Jingyuan, a modern engineer, wakes up and transforms into a down-and-out scholar from the Qianlong period. He also brings with him a space ring containing engineering drawings! Coinciding with the floods in the south of the Yangtze River, he took out the cement formula and dam drawings and wanted to build a flood control embankment to save the people, but was scolded by corrupt officials as "witchcraft". Fortunately, he met Su Wanqing, who knew technology, and helped him explain the "principles of concrete" to the officials. After the dam was built to block the flood, Lu Jingyuan was summoned by Qianlong and mistakenly thought that he was "the reincarnation of Lu Ban". Later, he improved textile machines, promoted potatoes and corn, fought against corrupt officials, and solved conspiracies. From a poor scholar to the Minister of the Ministry of Industry, he fed and clothed the people in the south of the Yangtze River - Qianlong: "Lu Aiqing, show me this 'excavator drawing' again!"
