In ancient times, the Chaos Divine Lord fell. His yang soul was reborn as an immortal, while his yin spirit was born into the demon realm. Su Nian, the legitimate daughter of the Su family, bears within her this half-divine body.
At the coming-of-age spiritual aptitude ceremony, Su Nian is found to have a completely ruined spiritual root. Xuan Yan, the senior disciple of the Taixu Immortal Sect, breaks off their engagement in front of everyone, making her a laughingstock. No one knows that the speck of black-and-red light at her fingertip signals the awakening of a body in which yin and yang coexist.
Bullied, humiliated, and robbed, Su Nian grits her teeth and endures, night after night rubbing her mother's old hairpin. Hidden in a crack in the pin are the truth of her birth and the secret behind her family's massacre. She is no good-for-nothing, but the only person in the Three Realms destined to cultivate both yin and yang.
She begins tearing away the disguise of a good-for-nothing with her own hands: she publicly rebuffs the man who broke off their engagement, enters the immortal sect, takes on its saintess, crushes talents from every faction, investigates her mother's death, and avenges her family. When her dual cultivation of immortality and demonic arts first bears fruit, the Three Realms tremble.
Immortals, demons, humans, and ancient beings all turn their attention to her in turn. Xuan Yan, senior disciple of the Taixu Immortal Sect, broke off their engagement himself, then changed his tune when he saw her brilliance, but it was too late for regrets. Mo Yuan, Demon Venerable of the demon realm, comes riding beneath the moon, convinced she is an old acquaintance from a past life. Xiao Jingheng, emperor of the human realm, sees her as a pawn, only to find himself ensnared. The mysterious ancient being Wuming calls her an "old friend," though his true name remains unknown.
Four men chase after their wives, from the human world all the way to the ninth heaven. But Su Nian only wants to ask one question: What exactly did her mother leave behind? Who killed her? And who, exactly, lives inside her?
The secret of her half-divine nature will be revealed to the world in the first fifty chapters of Season One. The Gate of Chaos will open toward the place she truly calls home.