Why didn't the pen names of the previous books change?

Why didn't the pen names of the books that had been completed before change? This problem involved the change of the name of the online writer and the copyright of the work. Usually, if an author changed his or her pen name, all of his or her works should change their pen names to ensure the unity and copyright protection of all works. There might be multiple authors under the pen name of " Tengxun Yunqi." They might have used different pen names to write. If the author of Tengxun Yunqi changed his pen name, then the previously completed works should also change their pen names. This was because changing the pen name meant changing the author's identity and creative identity, which involved the copyright and intellectual property rights of the work. If the previous work had been completed, the author might choose not to change the pen name of the work. This was because changing the pen name might bring some uncertainty and risk to the commerce and distribution of the work. For example, if the original pen name of the work was very famous, the new pen name after the change might have a negative impact on the marketing and distribution of the work. In addition, changing a pen name may also require the author to spend extra time and effort to adapt to the search habits of readers and search engines. To sum up, the author of the previous works that had been edited by the author of QQ Yunqi needed to analyze the specific problems and reasons why the pen names of the previous works did not change. If the work was completed and the author chose not to change the pen name, it might be because changing the pen name might bring some uncertainty and risk to the commercial and distribution of the work or because the author felt that changing the pen name would require extra time and effort to adapt to the readers and search engine's search habits.