In 1126, Jin soldiers pressed the territory, and the Northern Song Dynasty was in turmoil.
Li Mu, a doctoral student in civil engineering, became a minor official responsible for repairing ditches in Bianjing City.
He knew that in less than a year, the disgrace of Jingkang would be staged - the emperor was captured, the mountains and rivers were broken, and thousands of people were reduced to slavery.
But no one believed him.
In the court hall, the capitulationists sang "Certain territory and seek peace"; in the palace, the emperor was busy with calligraphy, painting and entertainment.
Li Mu could only rely on his own hands, brick by brick, to turn this dying city into an iron wall.
Cement, hanging ladders, hot-air balloons, homemade gunpowder... Modern knowledge is his only weapon in this era.
And Zhao Tan, the clan girl who held the sword and guarded the city, went from being suspicious to being by his side and became his only confidant in the desperate situation.
When the Jin army's iron hooves moved south again, what they were waiting for was not the defeated Song army——
Instead, it is a steel capital filled with anger and all the people are soldiers.
This time, the wheel of history has to change direction.
