Protagonist: Lin Chen (a modern military engineer who accidentally traveled to Beijing in 1900 and was bound to the "Tiangong National Defense System". The system can unlock modern military blueprints and training manuals, which need to be exchanged for "National Power Reconstruction Value". The weight value is obtained by recovering lost territory, defeating great powers, and improving national power)
Era background: In June 1900, the Eight-Power Allied Forces had assembled in Tianjin. Cixi had just declared war on the Eleven Kingdoms. The Qing army had backward weapons and poor military discipline. The Boxers were blindly anti-foreign. The factions in the court were fighting among themselves. The crisis of national subjugation was imminent.
Wear it clean and don't turn back [face covering]