The protagonist of A Madman's Diary was Samuel Chapman, who was considered a crazy person. In the novel, Samuel Chapman was portrayed as dissatisfied with reality and desperate for human civilization. He believed that he was a unique existence with the ability to surpass humans. His crazy behavior included destroying and destroying human civilization and trying to seek redemption through self-harm and suicide. The author's attitude in the novel was complicated. The author praised Samuel Chapman's crazy behavior and thought that he showed the extreme willpower and courage of human beings. At the same time, he condemned his violent and destructive behavior. The author also reveals the contradiction and distortion in Samuel Chapman's heart through the analysis of his thoughts and words, showing his deep thinking about human nature. Therefore, although the author's attitude towards Samuel Chapman was complicated, he also showed concern and criticism for crazy and extreme behavior.