Xu Xian () is a mythological figure in Chinese folklore, best known for being one of the main characters of the Legend of the White Snake, one of China's four great folk tales. The story has been adapted many times, including into Chinese operas, films, television series and other media. In some versions of the legend he is a scholar, while in others he is a physician. In earlier works such as Feng Menglong's Stories to Caution the World, he is known as Xu Xuan ().
Some legends say that Xu Xian and Bai Suzhen were actually immortals who fell in love and were banished from Heaven because celestial laws forbade their romance. They are reincarnated as a male human and a white snake spirit who lived in the mountains and take a human form after a thousand years. Respectively, their story begins. In an alternative version of the story, Bai Suzhen takes on a beautiful woman form to search for Xu Xian, who had saved her life in a past life. She feels indebted to him and wants