You're referring to the Chinese folklore-inspired fantasy romance film "The Sorcerer and the White Snake"!
The film opens with a chaotic battle between Fa Hai, a powerful sorcerer, and a massive serpent demon. After sealing the creature, Fa Hai dedicates his life to hunting evil spirits. Meanwhile, a young white snake gains magical abilities after swallowing a sacred pearl. She transforms into a human and saves Xu Xian from drowning — but the cost of hiding her true nature leads to jealousy, dragon-slaying sword fights, and a climactic flood that nearly destroys a city. the sorcerer and the white snake filmyzilla.com
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