Bright Sword: Starting from the Improved Grenade

(Not going to the front line, from zero to one, the protagonist will help the Eighth Route Army slowly develop a military industry system.) The protagonist Zhao Tianyang, as soon as he opened his eyes, traveled to the world of Bright Sword and became the reserve backbone of the arsenal under Yan Laoxi. Before he could come to his senses, the Japanese army invaded Shanxi, and he was forced to embark on the road of escape. The gears of fate also began to turn slowly at this time. ...