Whether the Yin-Yang Eight Trigrams could be modified or not depended on the specific work and situation. Generally speaking, the creation of a novel was usually conceived and created by the author according to his own creativity and inspiration, not directly modified by others. However, if the work has already been published or circulated, the modification may need to comply with relevant copyright laws and regulations. If the author has the copyright, he can freely modify the work, but he must abide by the relevant laws and regulations, such as modifying the copyright of the original work, not changing the basic plot and character image of the work, etc. In addition, he also needed to consider the readers 'reaction and acceptance when modifying the work. If the editing was not good enough, it might cause dissatisfaction and criticism from the readers, and even affect the reputation and sales of the work. Therefore, editing the work required careful consideration to retain the original work's characteristics and charm as much as possible, while also adapting to the needs and preferences of the readers. Whether the Yin-Yang Eight Trigrams could be modified or not depended on the specific situation and the rules of the copyright owner. If you want more information, you should consult relevant legal and copyright experts.