Focusing on the couple Lin Wei and Shen Yan, from the development of domestic radios in Shanghai in 1927 to the breakthrough, to the move to Chongqing to build a cave arsenal during the Anti-Japanese War to stick to the lifeline of communications, to the return to Shanghai after the war to rebuild the national electronics industry. Taking "technology as the blade and the country as the shield" as the oath, after experiencing foreign monopoly, Japanese military blockade and spy sabotage, he finally led the team to support the skeleton of China's electronics industry, allowing the concept of "technology to save the country" to be passed down from generation to generation, writing the war years and rise of the national industry.
