In the first year of Jingkang, the Jin army broke through the Yellow River with iron hoofs, and Bianliang, the capital of the Northern Song Dynasty, was in danger. Chen Yan, an apprentice in a blacksmith shop outside the city, accidentally activated the ancestral "Tiangong Manual" and awakened the engineering, metallurgy and basic scientific knowledge that transcended the times. When the city of Bianliang was destroyed and Emperor Huiqin was captured, the Central Plains fell into war and plunder. Chen Yan witnessed the tragic death of his relatives and friends and the destruction of his skills, and decided not to live any longer. He used the "Tiangong Notes" to improve farm tools, cast strong armor and sharp blades, organized refugees to build defensive villages, and survived in the cracks between the Jin army, defeated troops, and bandits; he repaired the water conservancy and workshops that were damaged by the war, protected the inheritance of craftsmen, and used knowledge to build a "survival defense line" for the people. In the end, he grew from an ordinary craftsman to a "fire holder" who protected civilization in troubled times. In the darkness of the Jingkang Disgrace, he lit up a glimmer of hope for revival.
