What was the identity of Green Snake in her previous life?

The green snake was a male herring that had been bred at the bottom of the West Lake for 500 years in its previous life. Green snake is a big male herring, which has been cultivated at the bottom of the West Lake for the past 500 years. It is the pleasure of green snake to think worldly things and like a woman who has no cultivation. Later, the green snake became a woman to accompany the white snake. She had no regrets and looked at the white snake and Xu Xian's various shows of love.