In the Romance of the Three Kingdoms, Zhuge Liang read the Romance of the Three Kingdoms. This book was a historical novel written by Luo Guanzhong, a novelist of the Ming Dynasty. It described the historical stories and characters of the Three Kingdoms period in China. Although this book is not a traditional Confucian classic, its influence is still far-reaching and is considered one of the important works in the history of Chinese literature. It was said that Zhuge Liang read this book very carefully and often read it over and over again in order to better understand and grasp the essence of it. Although this book was more difficult to understand than the Book of Changes, Zhuge Liang still worked very hard and devoted himself to reading it, and finally gained a deep understanding and thought. Therefore, it could be said that the Romance of the Three Kingdoms was more difficult to understand than the Book of Changes, but Zhuge Liang's hard work and concentration were also one of the keys to his success.