Legend has it that when the universe faces an enormous crisis, this being will appear in the mortal world to avert disaster.
In a remote region of an empire lives its fourth prince, Mu Fan, who is unable to cultivate martial arts. Fate may have made him a prince, but he feels deeply that he is useless. Fortunately, his father dotes on him, and his elder brother, the crown prince, loves him dearly. His life seems as calm as a still lake.
By chance, the fourth prince meets Ling Yue, the illegitimate daughter of the head of the empire’s Ling clan. She is strikingly beautiful, but has only mediocre talent.
An unexpected twist of fate brings the two together, and Ling Yue suddenly awakens memories of her past life. She discovers that she is the reincarnation of a Great Emperor from the Upper Realm. As these memories return, her cultivation quickly recovers, and she also discovers why the fourth prince cannot cultivate. She helps Mu Fan solve the problem that has plagued him and passes on her own legacy to him. Yet she believes she should not remain in this world, and quietly leaves.
The fourth prince, however, resolves to cultivate with all his might and make his way step by step toward a wider world. He averts the crisis threatening the universe, mends the flaws in this world, and forges connections with other worlds. Together with the guardians of those worlds, he protects all life throughout the myriad realms.