Liangjian, You Call This Made in the Border Area.

Chen Chang'an, a third-rate researcher at a scientific research institute, had no results after years of research. He was depressed at home, drinking, watching TV dramas about swordsmanship, and seeing how poorly the border weapons were made. He began to imagine that if he were the director of the border arsenal, he would definitely make the Eighth Route Army like the weapons made in the border area, and then he got drunk. When I woke up, I traveled to the world of Bright Sword in 1940 (before the Battle of Cangyunling) and became the deputy director of the border arsenal. He was an 18-year-old genius weapons expert who had just returned from studying in Germany. Also known as Chen Changan, his parents had been killed by the Japs. Two days ago, he was betrayed by a traitor when he entered the base area and was ambushed by the puppet army. He was shot in a coma for two days after being rescued by the Eighth Route Army. After Chen Changan woke up, he merged his memories and knew that the current world was the Bright Sword World of the parallel space, so he accepted the fact of time travel. After accepting the time travel, the system necessary for the time traveler appeared and was bound to a technology system. Through the system, various scientific and technological knowledge and technologies can be exchanged, but they cannot be exchanged for physical objects. Enemies killed by the weapons produced by Chen Changan will be fed back to Chen Changan's technology points, and technology points can be exchanged for technology. The science and technology system initially gave Chen Changan 1,000 science and technology points, which Chen Changan exchanged for local TNT technology and used TNT to make a batch of grenades. He happened to meet Li Yunlong asking for weapons from the arsenal, so Li Yunlong's fellow minister Zhang gave Chen Changan's batch of grenades to Li Yunlong. As expected, Chen Changan received 10,000 science and technology points a week later.