In Qingping Town, the poor scholar Lu Liang and the wealthy heiress Qianqian pledge themselves to each other beneath a peach tree, but her family does everything it can to stop the match, believing he is beneath them. Long Kun, the Peach Blossom Prince, has cultivated for a hundred years and fallen in love with Qianqian. He trades a century of cultivation for a human form and silently guards her window. Qianqian does everything she can to help Lu Liang travel to the capital for the imperial examinations, spending all her savings and even finding him a renowned tutor. Lu Liang promises to return and marry her, but after placing first in the exams, he is courted by the prime minister. Seduced by the beauty and power of the minister’s daughter, Xiangxiang, he forgets Qianqian.
When Lu Liang fails to return on time, Qianqian grows frantic and resolutely sets off for the capital to find the man she loves. The road is full of danger, but Long Kun accompanies her. His magic is weak, yet he gives everything he has: he turns a dead branch into a rope to fend off bandits, conjures a gust of wind to protect her from a lecher, raises a shield to face down wild beasts, and immobilizes their pursuers so they can escape an inn of thieves. In the capital, the prime minister sets his sights on Qianqian and tricks her into his residence, where she narrowly escapes being violated. Long Kun is gravely wounded rescuing her, and they hide in a ruined temple. When Qianqian learns that Lu Liang has changed his heart, she beats a grievance drum to seek justice, only to be hunted by the prime minister. Trapped in the temple, she nearly burns to death, but an immortal saves her, granting Long Kun a thousand years of cultivation and greatly increasing his power.
At last, on the day Lu Liang and Xiangxiang are to be married, Long Kun arrives with Qianqian and exposes the prime minister as a thousand-year-old fox demon, revealing his many crimes. He condemns Lu Liang for repaying kindness with betrayal and sends both men to prison. The prime minister is brought to justice, and righteousness prevails. Long Kun and Qianqian then return to their hometown and spend the rest of their peaceful lives together beneath the peach tree.
