From Bright Sword to Safe Mountains and Rivers

Qin Yi was sent back by the system to the era when the mountains and rivers were broken. From the ancient method of penicillin and "old mustard marinade", it has grown step by step into a solid and powerful backing for the "iron triangle". It is said that Li Yunlong has a master who dares to attack Taiyuan. I can't afford a division of troops, but do you think these guys are doing well? I'm not good at leading troops. I'm good at making equipment. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.