Cai Jun was a well-known online author. His novels were well-loved by readers. His Tianji series was one of his representative works. The series used history as the background to tell the adventures of a group of young people in historical events. Cai Jun's novels were famous for their vivid plots, profound character creation, and unique style. His works usually involved love, friendship, family, faith and many other topics, and presented rich characters and profound social thinking. Therefore, different people might have different opinions on whether Cai Jun's Tianji series was good or not. Some people might like the plot and character of the series, while others might think that the series is too fictional and lacks historical basis. However, regardless of whether the readers liked it or not, they could learn some valuable knowledge and thoughts from Cai Jun's novels.