Fairy in White Snake Painting

Where did Liu Yi go in the end? Is Nankeyimeng just a dream? What is the surname of the chivalrous girl, who comes from? Where is Wuzhuang Temple? Why is Zhen Yuanzi, the ancestor of the Earthly Immortals, not famous after his journey to the west? Why did the Poseidon become the Concubine of Heaven? Where did the real dragon Mazu go? The second disciple of the Buddha was always the Venerable Kasyapa. Who is Jinchanzi? Why must Bai Suzhen marry Xu Xian? Who is Xu Xian? As Bai Suzhen's teacher, why does Lishan's old mother never show up? ……… What's the connection behind all this?