Tiening, a 28-year-old master of modern metallurgical engineering, woke up after three years of hard work in a steel factory and became a beaten and scolded apprentice girl in the blacksmith shop of Shuozhou, a border town in the north of the Great Yan Dynasty. Facing this era where even a good knife cannot be struck - a piece of smelted iron is as soft as dough, with less than 0.1% Carbon content, farm tools break in an hour, and a soldier's knife breaks after three hits with a prairie scimitar - she decided to use her knowledge of modern metallurgy to start by building a blast furnace to change the world. Huo Quji, the captain of Shuozhou, originally wanted to teach this girl a lesson, but he saw with his own eyes that she used a pile of stones and mud to create molten iron that had never been seen before in this era. The moment the molten iron rushed out, the absurdity in his eyes turned into deep shock - and then heartbeat.
