My ex-husband who had attained enlightenment has returned to the mortal world.

Lang Heng is the High God of the Celestial Realm, the nephew of the Eastern Yang Emperor and the son of the Nine Light Mysterious Goddess and the God of War. Renowned as the most promising deity in the Nine Provinces, he is destined to succeed his uncle as the common ruler of heaven and earth. However, after spending a hundred years in the mortal realm to undergo a trial of love, he returns to the Celestial Realm only to find himself unable to enter samadhi. Despite his outward composure and reputation for being selfless and upright, Lang Heng is haunted by fragmented memories of a woman named Bai Yu, a cultivator from the Xuanling Sect who died saving his life. The Taibai Star Lord diagnoses that Lang Heng has an unresolved love debt that prevents him from maintaining his original heart, advising him to descend to the mortal realm again to compensate for this karma.

Lang Heng agrees to the descent but is warned that he must hide his divine roots to avoid detection by the Celestial Realm, limiting him to the power of a mortal with great cultivation. He chooses the identity of Xian Jue, a disciple of the reclusive Wuyouzi from the Wuji Sect. Upon arriving at the ruins of the once-prosperous Xuanling Sect, he discovers that the sect was destroyed by the Demon Clan five hundred years ago after the Xuanling Divine Tree, which sustained it, fell. Using the Soul-Tracking Lamp, a magical artifact from the Immortal Realm, Lang Heng locates the reincarnation of Bai Yu, now known as Liuli. Liuli is a rogue cultivator with a severely damaged spiritual root who has spent the last five hundred years attempting to recover by engaging in dual cultivation with handsome male cultivators. She is currently ambushing disciples of the Wuji Sect at the foot of the mountain, employing a dramatic method of falling from a mimosa tree to catch the attention of potential partners.

When Liuli performs her usual routine, Xian Jue appears and catches her, replicating a scene from their past life with uncanny precision. Although Liuli does not recognize him, she is intimidated by his cold and noble aura. Xian Jue, however, feels a strange sense of familiarity and emotional disturbance upon seeing her perform the Seven Carefree Swordplay, a technique he remembers her using in his previous life. He reveals that he came specifically because of her, shocking both Liuli and the Wuji Sect disciples Zhu Nanshi and Ji Changfeng who are present. Despite his claim that he has no feelings for her and views their connection as a debt to be settled, Xian Jue infiltrates the Wuji Sect using Wuyouzi’s identity to stay close to Liuli.

The group travels to Luohe Town to investigate reports of demons causing trouble, only to find the town eerily peaceful with residents displaying unnatural happiness. They are hosted by the local leader, Shen Sheng, and his friend, Bai Wushuang, who possesses an ethereal voice and high cultivation. Xian Jue suspects Bai Wushuang is connected to the Immortal Realm due to his ability to control minds using the Gu Heart Technique, a spell that bewitches both thoughts and body. He discovers that Wuji Sect disciples, including his own junior disciple Gu Yu, are being controlled and forced to practice until they lose their humanity. Xian Jue decides to play along with the deception to uncover the truth, while Liuli, unaware of the danger, continues to pursue her own agenda of finding a suitable dual cultivation partner among the sect’s disciples.

As the full moon approaches, tensions rise. Bai Wushuang is revealed to be injured, suggesting internal conflicts within the demon faction. Liuli’s reincarnated memories begin to surface, triggering a sense of loss and panic in Xian Jue that he cannot explain. The story moves toward a confrontation where the true nature of the conspiracy in Luohe Town will be exposed, forcing Lang Heng to confront the remnants of his past life and the woman who died for him, while Liuli navigates her complicated feelings toward the mysterious cultivator who seems to know her from a lifetime ago.