Based on the folk legend of the same name, the series is set in imperial China during the Southern Song dynasty and focuses on the romance between Xu Xian, a physician based in Lin'an, and Bai Suzhen, a 1000-year-old white snake spirit that has taken the form of a beautiful young woman. Xu and Bai's cross-species love is opposed by Jin Ruyi, the young daughter of Xu's master, who is infatuated with Xu. Ruyi's obsession with Xu creates a grudge between her and Bai. Xu and Bai's relationship was also initially opposed by Fahai, an orthodox Buddhist monk who harbored a bias against demons. Throughout the series, Bai is accompanied by Xiao Qing, a 500-year-old green snake spirit who is later revealed to be a demigod. Qing shares a sisterly bond with Bai because of their similarities and remains loyal to her.
Cast
Main
Ju Jingyi, as Bai Suzhen, is a 1000-year-old white snake spirit who was cultivated alongside Jingsong on Mount Emei before moving to Lin'an. Bai is noted for her beauty, intelligence, and righteous nature. She falls in love with Xu Xian and opens the Baohe Clinic with him. She is close friends with Jingsong and Xiao Qing.
Yu Menglong as Xu Xian, a kind-hearted and intelligent physician who comes from a wealthy family. Due to his parents' untimely deaths, Xu was raised by his older sister, Xu Jiaorong, and previously worked for Jinshi Clinic before opening Baohe Clinic with his wife, Suzhen.
Xiao Yan as Xiao Qing, a 500-year-old romping and cross-dressing green snake spirit who is the daughter of the snake spirit Yu Furong and the Dragon King Ao Guang, making her a demigod, and Qing bears a striking resemblance to her mother when she was much younger. Her mother was killed because of her relationship with Ao Guang, as Heaven did not permit love between demons and gods. However, her father was not because Jade Lotus refused to reveal his identity. Qing learned of her demigod status late in the series and eventually reconciled with her father.
Pei Zitian as Fahai, a Buddhist monk from Jinshan Temple. His obsession with eliminating demons resulted in him strengthening the Mind Demon. After reaching enlightenment, Fahai helps Hanwen save Suzhen from her death.
Yu Lang as Jin Ruyi, owner of Jinshi Clinic, who is in love with Xu, whom she refers to as Hanwen. Wang Daoling, a frog spirit, claims her to be the reincarnation of his previous love. Ruyi's hatred and jealousy towards Suzhen allow the Mind Demon to reside in her. Realizing the sins that the Mind Demon tricked her into committing, Ruyi kills herself in a futile attempt to kill the Mind Demon.
Supporting cast
Nie Zihao as Jingsong, a golden mouse spirit who is a close friend of Suzhen. His jealousy towards Xu drove a wedge between him and Suzhen, though they later reconcile when Jingsong helps Suzhen save Xu. While helping Suzhen, Jingsong used magic that quickly depleted all his years of cultivation. Suzhen believed Jingsong's soul had been scattered as a result, although it was later revealed that his good deed pleased Heaven and allowed him to be reborn, albeit in the form of a golden squirrel.
Feng Jianyu as Zhang Yutang, an herb collector who worked for Baohe Clinic. He falls in love with Qing, who helps him learn of his identity as a nobleman who was kidnapped as a child.
Li Lin as Li Gongfu. Brother-in-law of Xu and husband of Xu Jiaorong. Li came from a poor family, but was the only suitor of Jiaorong who agreed to allow Xu Xian to live with them after marriage. Li works as a county official for Lin’an.
Zeng Yunzhen as Xu Jiaorong. Jiaorong raised her brother Xu Xian from a young age. She is skilled in housework and wants the best for her younger brother.
Maggie Chen as Yu Furong, Qing’s mother. Yu’s relationship with the Dragon King Ao Guang results in her death. She refuses to reveal Ao as the one whom she had an affair with, thus sparing him.
Wang Weiyuan as Wao Daoling. A frog spirit who is in love with Jin Ruyi. He goes to great lengths to please her, though he eventually dies at her hands.
Hou Changrong as Dragon King Ao Guang. Ao was deeply in love with Yu Furong despite Heaven’s Law forbidding them from being together. After Yu’s death, Ao refuses to acknowledge Qing as his daughter and sends the Four Immortals to guard over Qing at the West Lake. At the end of the series, Ao sincerely apologizes to his daughter for his cowardice and invites her to stay with him at the Crystal Palace.
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