Nine Heavens Black Phoenix: the Demon Emperor's Prison Pet

In the prehistoric period of ancient times, the three realms of humans, demons, and immortals coexisted, and wars continued. The story mainly takes place in the fairy world above the nine heavens, and at the junction of the human world and the demon world. The heroine is the reincarnation of the ancient mythical beast Nine Heavens Black Phoenix. She has powerful bloodline power, but she lives in the world because of her sealed memory. The male protagonist is the supreme figure in the demon world, cold and ruthless, but he falls in love with the female protagonist at first sight. The two have opposing identities, but they fall in love due to the entanglement of their fates, and in the end they cannot escape the fate of their love.