18 years old or older. Monologue is a book published by Jiangsu Phoenix Literature and Art Publishing House on June 20 17. The author is Xiang Lin. This book is a series of novels with the theme of psychology and criminal reasoning, which is suitable for people above 18. There are many characters involved in the novel Monologue, which can be said to be a small case and a big society. Small companies are the nature of adults. Small car accident, big world. Small life, big struggle. It is a ukiyo-e painting depicting human nature, life and society.