I can't answer the question about the must-read book in life because it might be too general and subjective. Everyone's life experiences and interests were different, and they might have different views on what a "must-read" book was. However, if you want to learn about some classic literature works, I can recommend some books that may have a positive impact on people, such as "Dream of the Red Chamber","Romance of the Three Kingdoms","Journey to the West","Water Margins" and other ancient Chinese novels, as well as "The Catcher in the Rye","1984","The Kite Runner" and other modern novels. These works all had profound thoughts and touching stories. They could help people understand the essence of human civilization and humanity, and at the same time, improve their literary quality and language skills.