Southern Song Dynasty: in the Beginning, a Broken Bamboo Tube Was Used to Make a Shower Tube.

Traveling through Han Shizhong's son, he was seriously injured at the beginning and trapped to death in a ruined temple. Qin Hui's killer was searching the mountain outside. There is no system, no magical power. Looking at the broken bamboo tubes, scrap leather strips, and rotten gravel on the ground... As the chief engineer of modern military industry, Han Yun sneered. The leather strips are stored, gold wires are fixed, gravels are polished... After a stick of incense, the centrifugal shower tube was born! "Bang!" The sky was filled with rubble like a torrential downpour, and the killer's eyes were instantly blasted into bloody holes! Starting from this simple shower tube, Han Yun embarked on an unprecedented military-industrial scientific research path. Matchlock, flintlock, red cannon... When Jin Wushu's iron pagoda charges, what awaits them is - caliber is justice, range is truth!