A Madman's Diary was a classic novel that used a first-person narrative. The advantage of this narrative was that it allowed the reader to understand the characters and plot in the story more deeply and to better feel the author's emotions and thoughts. Through the first-person perspective, the author could directly participate in the story, making the story more believable. In addition, the first-person narration could also enhance the narrative style of the novel, making the story more lively and interesting.