There might be the following types in modern China: 1. Personal habits: Some of them may be because they prefer to express their personality and style when writing. Using a pen name could also make it easier for them to be recognized in public and increase their popularity and influence. Avoiding legal issues: Writing under your real name in some countries may face legal issues. For example, in the United States, real names are considered personal identification. If a work written using a real name is published or sold, it may face copyright issues or other legal issues. Therefore, some. 3. Easy to cooperate with. For example, they might use the same pen name to work together. This would facilitate cooperation and communication between the two parties, as well as avoid confusion and misunderstanding. 4. Personalization: Using a pen name can also make the work more personal. Using a pen name could make the work more unique and charming. Modern China included personal habits, avoiding legal problems, ease of cooperation, and personalization.