The belief that immortals are inherently good and demons inherently evil is nothing but a shackle invented by those in power. The upper ranks of the Nine Heavens Immortal Realm, the old nobility of the demon race, and the hidden mortal cabals have stirred up a thousand years of war between immortals and demons to seize the fortune of eternal life and monopolize resources, using cultivators, demons, and common folk as pieces in their game.
Xie Xuechen, the foremost sword cultivator of the Nine Heavens, and Yuzhaozhao, a nine-tailed cat demon saintess, begin their game of wits as captor and captive. One stays true to the heart of the sword and investigates the truth behind a betrayal; the other uses his sword heart to unravel the mystery of an ancient demon seal. Through solving mysteries, testing each other, clashing, and working together, they expose the greed and crimes of all three factions. Rather than dwell on grand tales of the three realms vying for supremacy, the story focuses on ordinary people struggling, persevering, and standing by their principles amid war. It breaks down the rigid labels of good and evil, showing that morality is never defined by one's race: the measure is the good or evil in one's heart. The protagonists overthrow a corrupt old order and establish new rules for peaceful coexistence, defending the basic right of ordinary people to live in peace.
