Mr. Fujino was the teacher of the author when he was studying medicine in Japan, and he was very concerned about the author. Mr. Fujino is not particular about life, but he is sincere and fair, tireless to students, meticulous in research, and has a broad mind beyond national boundaries for academics. He corrected the mistakes in the author's notes one by one. In a foreign land, Mr. Fujino's serious teaching attitude and sincere and selfless love gave great encouragement to young Lu Xun. "Whenever I am tired and want to be lazy at night, I catch a glimpse of his black and thin back under the light ... This makes me suddenly realize my conscience and increase my courage, so I light a cigarette and continue to write some words that make people like' gentlemen' feel deeply painful."

Fan Ainong is a friend that Lu Xun met on the way to find someone else. As an ordinary patriotic intellectual, his experience is typical. He is Geng Jie and Extreme. After the revolution, he also worked and taught. He was really diligent, but in the end, he was pushed out by that society and drowned. The author is full of sympathy and indignation.