The series Graded Readers for Chinese Language Learners is composed of 50 books, divided into three subseries, namely folktales, literary stories and historical stories, corresponding to Levels 1-3 respectively. The rich and fun content and easy-to-understand language makes it easy for everyone, whether they are foreigners learning Chinese, children with parents of Chinese origin, ethnic minority students of the Chinese language, or even primary school students in China, to read this series. It enables the readers to gradually improve their Chinese reading skills and enhance their understanding of Chinese culture by reading and enjoying stories.

The “Literary Stories” subseries is based on the Four Great Classical Novels in ancient China. From each novel some epic snippets are extracted and adapted into 4-6 books, each with 20-30 thousand characters. Altogether there are 20 books in the subseries, six of which are from Romance of the Three Kingdoms, four from Water Margin, six from Journey to the West and four from Dream of the Red Chamber. Romance of the Three Kingdoms is a historical novel, which was set at the end of the Han Dynasty and the Three Kingdoms period. There are six books in this series based on this novel, namely Oath of the Peach Garden, Discussing Heroes While Drinking Wine, Battle of Chibi, Zhou Yu Is Frustrated Three Times, The Stable Coexistence of the Three Kingdoms, and The Union of the Three Kingdoms. 

This volume tells Liu Zhang of Xichuan asked Liu Bei for help. Liu Bei took Xichuan and Hanzhong after defeating Cao Cao. Hence, the stable coexistence of the kingdoms, i.e., Wei, Shu and Wu took shape. Cao Cao became the King of Wei, and Liu Bei became the King of Hanzhong. Zhouge Liang asked Guan Yu to attack Fancheng. Guan Yu defeated the Cao Army, but he was later defeated by the enemy. He lost Jingzhou, went to Maicheng, and was finally killed by Sun Quan of the Eastern Wu.