Gray Ruins

On the seventh day when ashes covered the sky, civilization collapsed, and the survivors gnawed expired cans in the ruins and waited to die. Lu Yuan, a retired special forces soldier, didn't want to wait - he killed three looters with a modified nail gun, took over an abandoned military factory, and then started "laying bricks" in the wasteland. There is no system, no superpowers, no supplies falling from the sky. There is only a diesel generator, an old car mechanic, a female emergency department doctor, and an iron rule - don't feed idle people, don't save the Virgin. From a leaky workshop to a fortress populated by tens of thousands of people, from a nail gun to an army. When the walls of the first city in the wasteland were raised, everyone realized that he was never seeking survival, but building a country.