On the day when the capital of Wei was besieged by millions of enemy troops, the demoted officer Xie Zhao detonated a cannon and blew open the imperial city gate, causing an uproar throughout the city. The exiled female doctor Su Li secretly helped him purify the gunpowder, while the eunuch Liu Wuchen's secret road map and the enemy commander He Xiao's iron-blooded rules pushed the rebellion into the unknown abyss. When Xie Zhao's artillery fire ignites the corrupt system instead of the roofs of the people, Su Li's bloodline, Grandma Cui's nursery rhymes and Yan Li's old sins are dragging the entire dynasty into a firearms revolution that even the gods fear.
