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It is based on the novel Three Lives Three Worlds, The Pillow Book by Tangqi Gongzi, and is the sequel to the 2017 drama Eternal Love. It tells the entangled love story of Donghua and Bei Fengjiu lasting for 3 lives. Being rescued by Dong Hua when she was little, Bei Fengjiu is prompted to return this favor. Her admiration and gratitude gradually turns into love. When she was little, nine-tailed red fox Bai Fengjiu got lost in Demon Realm, where she was attacked by a savage beast and rescued by Dong Hua, the former emperor of the Heaven Clan. This makes her determined to repay this life debt. She enters Taichen Palace, sleep-improving headrest where Dong Hua lives, as a maid to find an opportunity to repay him. To save him from the Ten-Lotus ward, she is turned into an ordinary one-tailed fox, which Dong Hua, unaware that the fox is one of his maids, then brings back to his palace and raises as a pet.

Hearing that Dong Hua is about to marry Ji Heng - princess of the Demon Clan, Fengjiu leaves Taichen Palace. Dong Hua then searches for her but fails to find her. Fengjiu is finally able to repay her life debt to Dong Hua by helping him in his mortal trial, but in the process, the mortal Yi Qingti dies protecting her. Dong Hua and Fengjiu encounter each other several times both in Fengjiu's home of Qing Qiu and in heaven. While Dong Hua quickly takes interest in her, she keeps avoiding him. Dong Hua brings a handkerchief, knowing that it is Fengjiu in disguise, to a battle against Yan Chiwu, where a cyclone appears and sweeps both Chiwu and Fengjiu into Fanyin Valley. 6 months later, Fengjiu registers for a competition, where the prize is a pimpon fruit (a magical fruit capable of reviving mortal bodies), to revive Ye Qingti, whom Fengjiu feel indebted to as he died to save her.

Dong Hua, who comes here as a teacher, trains Fengjiu to prepare for the competition. Upon winning, Fengjiu is soon disappointed because the prize has been switched to peaches and heartbroken to hear from Ji Heng that Dong Hua gladly gave her the fruit at her insistence. Determined to get it at all cost, Fengjiu comes to the snake's maze and ultimately enters Aranya's dream. She is then saved again by Dong Hua, and they both realize their feelings for each other. On their wedding day, Dong Hua does not show up because Ji Heng emotionally blackmails him and compels him to stay single forever. He furiously transfers poison from her body to his own and prohibits her from ever leaving the Demon realm. A brokenhearted Fengjiu leaves and starts her new life in the mortal realm with her son Bai Gungun. At their last meeting before Dong Hua's final battle with Miao Luo, he gives her a ring made from half of his heart, which she refuses.

When she finds out that Dong Hua is about to die in a battle, she decides to join it to help him; and they finally succeed in defeating Miao Luo. While treating Fengjiu, Dong Hua gets to meet his son Gungun. Dilraba Dilmurat as Bai Fengjiu - The youngest female monarch of Qing Qiu, and the only known nine-tailed red fox in the world. Bai Yi's daughter, Bai Qian's niece, Dong Hua Dijun's wife and Gungun's mother. The first heavenly emperor of the Heaven Clan; the man who united the world. Zhang Gong as Bai Zhi - King of the Fox tribe. Wife of Bai Zhi. Bai Qian, Bai Zhen, and Bai Yi's mother. The first phoenix deity in the world. A well-known peach winemaker and a renowned doctor who resides in the peach blossoms forest. Second son of the Fox King. Fourth son of the Fox King. Youngest daughter of the Fox King. Former female monarch of the Qing Qiu kingdom and current Crown Princess of the Heaven Clan.