Time-traveling novels were a common type of science fiction. They usually told stories about a person or organization who went back in time to change the course of history in some way, thus shaping a different fate and ending. Time-traveling novels often involved the concept of time travel. The protagonist needed to find a way to return to the past through various adventures and challenges. These novels often explored the moral and ethical issues of time travel, such as whether the protagonist should change history or risk interfering with the past. Time-traveling novels were very popular in the literary world and on the Internet, attracting a large number of readers. Some of the classic works include Time Machine, Back to the Future, Doctor Who and the Time Traveler, etc.