Time travel novels are a popular genre of literature in which the protagonist travels to different historical or fictional worlds to explore and change the past or present. There are many reasons why time-travel novels are popular. 1. Exploring the Unknown World: The time-travel novel provides a mysterious and unknown world for the protagonist to explore and discover new cultures and history. This feeling of exploring the unknown was very attractive, making the readers excited and curious. 2. Changing history: The protagonist of a time-travel novel usually changes history, sometimes changes past events and characters, and sometimes creates new history. This feeling of changing history could also stimulate the interest of readers and make them want to know more about the history and truth of this fictional world. 3. Create unique characters: A time-travel novel can allow the protagonist to grow and develop in different historical and cultural backgrounds to create unique characters and destinies. This feeling of creating a unique character could also attract the interest of readers, making them want to understand the inner world and behavior of the protagonist more deeply. 4. Increase plot conflicts: Time travel novels usually have many plot conflicts, such as conflicts between the protagonist and his past self, historical figures, or other characters, or conflicts with other people in the modern world. This kind of plot conflict can make the reader feel nervous and excited, increasing the fun of reading. Time travel novels could provide a unique reading experience, explore the unknown world, create unique characters, increase the conflict of the plot, and thus attract the interest and curiosity of the readers.