The tale is pretty detailed and it has taken on several interpretations, but the cliff notes version includes a boy who bought and ate some immortality beans, not knowing what they were. Over the next few days he didn't need to eat and asked the merchant why. The merchant takes him to Westlake, flips him upside down and causes him to vomit the beans into the lake. They are then eaten by a white snake who is expert in the taoist arts, who gets 500 extra years of life from them.
The monk, still bent on destroying the union, imprisons the white maiden in the Leifing Temple. While she is imprisoned, she gives birth to a talented (and in some versions divine) son who defeats the monk, frees his mother, and reunites his parents twenty years later.
The Leifing Temple was built in 975 A.D. and has had to be reconstructed since. It has occupied that spot above Westlake for well over 1000 years. President Nixon said that Americans measure time in decades, Europeans measure it in centuries, and the Chinese measure it in millennia. When I think about the Leifing Pagoda and the legends surrounding it, I think of things that are made to last and to be redemptive--like love and marriage. And I realize that wherever we go in the world, these things are deep in people's hearts.