Starting Military Industry From The Perspective Of "The Sword"

I would like to know what Old Li did before the plot of "Bright Sword" unfolded

Once the Eighth Route Army has sufficient good weapons, what else can our old Li accomplish

If you really want to know, then read the book! After finishing it, you will understand the perseverance and hardships of the Eighth Route Army at that time! ... Even if the protagonist has a system