Lu Yu, a herb-gathering youth, encounters the spirit snake Su Yao injured during her tribulation when entering the mountain. Kindly helping her massage her belly, he accidentally forms the snake clan's unique half-life seal, and Su Yao decides that Lu Yu needs to take responsibility for her. Lu Yu originally intended to use a precious ginseng to cure his blind mother's eyes, and Su Yao promises to take only half the ginseng, transforming into human form to come propose marriage after curing Mother Lu's eyes. Someone in the village, wary of Su Yao's demon identity, plots to frame her, yet Su Yao saves endangered children regardless of past grudges. When a severe drought strikes, to clear the blocked main water vein, Su Yao willingly draws heavenly thunder, and through her benevolent deeds is canonized as the Peach Blossom Spring Deity, guarding the waters and lands of Wangxi Village, where the family lives in peace and steadfastly protects one another.