2. In unofficial history, there are many private historical biographies that are not officially recognized, such as Mu Chuan and Zhao Chuan. There are many things that the official history dare not do, but they are also full of hearsay and fabrication. Readers need to distinguish carefully.
3. Legends and novels. At first, it was an anecdote written by some literati, which was mixed with many biographies, such as Xu Qiuzhuan and Yingying Zhuan, but there were more and more fictional elements.