The Supreme Demon Emperor, Lu Qing'an, grows weary of slaughter and conceals his identity to become cultivation partners with Xu Qingying. Together, they raise three children, one son and two daughters. For a thousand years, he willingly plays the role of a gentle husband with supposedly low cultivation. However, on the very day his wife ascends to the throne, she divorces him publicly in pursuit of the ultimate power of the Flawless Emperor's Realm. Lu Qing'an takes his two daughters back to the Demon Realm and reveals his true identity as the Eternal Night Demon Emperor. The conspiracies of his ex-wife's master, Lin Qingxue, and the Supreme Lord gradually come to light. After learning the truth, Xu Qingying is consumed by regret.