Yuan Zhen
There is a debate over two possibilities of how the story evolved. One group believes that in 795 three friends told the story amongst one another. Another position states that a professional storyteller had performed in front of Bai Xingjian and Bai Juyi, and Yuan Zhen, and that Bai Xingjian obtained the story from the storyteller. One author, Tatsuhiko Seo, believes that the story comes from a storyteller.