Modern programmer Xu Xian died suddenly from staying up late, and upon waking up, he transmigrated to become Xu Xian in the Legend of the White Snake. Well aware of the tragic original version, he is determined to rewrite his destiny. In front of the Broken Bridge at the West Lake, he publicly refused to borrow an umbrella to form a bond with Bai Suzhen, and instead took a special interest in Xiao Qing, the hot-tempered Green Snake with a tough exterior and a soft heart. He used modern internet thinking to sell soap and start a business, workplace KPIs to reform the underworld management system, junior high chemistry to expose the toad spirit's poisoning scam, and even Sanskrit scriptures to rebut Fa Hai. In this world predestined by fate, Xu Xian insists on reconstructing the "bottom-layer code," teaming up with Xiao Qing to forge an unconventional path as bickering sweethearts.