This article looks at the Sino-Japanese war from the perspective of a Japanese military doctor who stayed in Zhengzhou, Henan and became a Chinese. He witnessed the process of China growing from a weak and weak country in suffering to a powerful country with strong national cohesion. During the war, Japan's cruelty to the Chinese people was intolerable. After the war, he sought redemption for his companions in China, and finally won the recognition of the Chinese people with his own virtue. If you want others to respect and recognize you, you do not rely on force to conquer, but let yourself become a part of the other party and integrate into other people's lives. This should be an issue worth reflecting on for some militaristic countries.