The main reason why online novels were difficult to go beyond national borders was that their content usually involved sensitive topics such as politics, religion, and culture, which might cause controversy or dissatisfaction in other countries. The content of online novels was often rich, including a large number of plots and characters. If it was made public, it might cause resistance and disgust from other countries. Because online literature often has the characteristics of cross-border communication, its content needs to conform to the cultural and social background of different countries, which may make it difficult to gain widespread recognition and acceptance in other countries. Laws and systems in different countries could also affect the creation and spread of online novels. For example, some countries might ban the use of certain words or plots or impose strict regulations on copyright protection, which might limit the cross-border distribution of online novels. The main reasons why online novels were difficult to go beyond national boundaries were that their content involved sensitive topics, restrictions on cross-border transmission, and laws and systems of different countries.