In the third year of Xining in the Northern Song Dynasty, mechanical engineer Shen Kuo (the same name as the historical figure) traveled to a post station on the outskirts of Bianjing. After waking up, the "Destiny Selection" system is triggered, and you need to choose two abilities from seven ancient identities. When he chose "Secret Records of Craftsmanship" and "Essentials of Arithmetic", he found himself involved in the dispute over technological innovation during Wang Anshi's reform. Is it to help the new party make ordnance, or to protect traditional craftsmen with modern knowledge?