The merfolk princess takes human form and enters an immortal sect to cultivate in seclusion for twenty years. When she emerges, she discovers that her people have been wiped out. Too weak to take revenge, she sets out on a different path to immortality.
You cultivate as humans; I cultivate as a demon. You become immortals; I become a devil. I'll make every last one of you kneel before me and beg for mercy. If all the gods and Buddhas in heaven won't save the people, then I'll help them descend into the Ninefold Underworld...