They Come from Thousands of Years Ago

(A slow-burning article, the main text is from the male protagonist, and the introduction is from the female protagonist's perspective) There was a white snake that lived for a thousand years. Every hundred years, she falls in love with a mortal named "Xu Xian". Then, watch him die in reincarnation. And the green snake that had been with her for a thousand years finally got tired of waiting. ——This is a story about how two snakes compete for the same owner.