C623

"Your Majesty, look behind us!" After Xie Fei drove out of the Chang'an City, his destination was the Tsui Hua Mountain in the northern foot of the Qin Mountains. The Institute of Science and Technology's firearm launch site was built there. Gunpowder was a dangerous thing, and if one was not careful, it could cause a serious disaster. As Xie Fei was familiar with the danger of gunpowder