On the Way Home, There Was a Tree Full of Flowers

Who said that if Leifeng Pagoda collapses, the white snake in the West Lake can escape from Leifeng Pagoda? Who said that White Snake, Xu Xian, and Green Snake would achieve enlightenment and fly into the sky together? If Xu Xian passes away due to illness and White Snake finds out at the bottom of Leifeng Pagoda, he destroys his millennium of practice and goes with Xu Xian, while Green Snake is willing to give up 500 years of practice and fall into reincarnation. Will they meet again? Conception: