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.In the book Lady White Snake, a man called Xu Xian saved a white snake in one of his former lives. Two thousand years had passed and the white snake cultivated itself into the form of a young lady and called herself Bai Suzhen. Bai Suzhen found Xu Xian in this life and they fell in love. To fight against the monk Fahai who tried every means to destroy her relation with Xu Xian, Bai Suzhen made a big mistake by drowning the Jinshan Temple. After giving birth to a son, she was put into prison under the Leifeng Pagoda.