The white snake, Bai Suzhen, transforms into a woman in Mount Emei after a thousand years of cultivation. She decides to practice in the human world and do good deeds to become immortal. She saves Qing’s life and they become sworn sisters. Later, she and Xu Xian fall in love and get married. However, humans and demons belong to different worlds. At last, she is imprisoned in the Leifeng Tower, while Xu Xian travels around to cure patients to atone for his wife’s sins....