Bai Suzhen (Liu Tao) and Xiaoqing (Chen Zihan), the thousand-year-old snake demons of Mount Emei, come to the human world to become immortals as soon as possible. They meet Xu Xian (Pan Yueming), a scholar hiding from the rain on the Broken Bridge of West Lake, and fall in love with each other. Fahai (Liu Xiaofeng) vows to kill Bai Suzhen in the name of killing demons and eliminating evil. He uses his apprentice Shi Tian (Shi Liang) to perform a magic trick to force Bai Suzhen to show up and scare Xu Xian to death. Bai Suzhen is familiar with pharmacology. She risked her life to steal the immortal grass to save Xu Xian, but Fahai imprisoned Xu Xian in the Jingtai and could not see him. Bai Suzhen was furious and cast a spell to flood Jinshan Temple. Xu Xian, who woke up, didn't care whether Bai Suzhen was a human or a demon, and wanted to kill her. Fahai, who was eager for quick success, wanted to become a Buddha, but he was trapped by the devil's heart and became a crazy demon. Bai Suzhen gave birth after ten months of pregnancy. Xu Xian got rid of the devil and reunited with her. The devil Fahai repeated his old tricks and pressed Bai Suzhen under Leifeng Pagoda. Before parting, Bai Suzhen shed the first and last tear of her life...