He is a high-level Fluctuating Immortal in the Nine Heavens. He merged with the memory of the demon for his sister, but as a result, he gave birth to inner demons.
She is a strange little sword spirit who was born in the demon world. She was innocently scattered and her spirit body was scattered, but she was lovingly protected by the Demon King. She lives for her obsession, but one thought turns her into a demon, vowing to kill all the gods in the fairy world.