During the Nirvana Tribulation, the Thousand-Year-Old Phoenix King lost all his demon power and returned to his original form. When he was dying, he was picked up by a passing Immortal Lord and raised as a pet. From then on, the Demon King became an Immortal Pet. Unfortunately, the demon power is difficult to recover, and the food in the Immortal Firmament Palace is indeed delicious... And the thousand-year memories that were temporarily forgotten were slowly restored and awakened bit by bit with the Immortal Lord. And in the final chapter of the dream, all the past comes to light, and the beauty of the past is nothing but a mirror. Trust, betrayal, injury, support, when will this prosperous thousand-year dream wake up?