In the ancient troubled times where the legendary monster Jiuying roamed the lands, the five great elements joined forces to lock the demon. However, Jin Zhengyi was not sealed and became a thousand-year-old wandering soul. He then uses all sorts of intrigues and wiles to reincarnate as the Emperor of Yan. His goal was to re-gather the five great elements and release the legendary monster Jiuying, causing great chaos to the world. The obsession of past life, the love, and hate of this life, faced with the entanglement of the millennium, the five people fell into a situation of incomparable contradictions. In the end, Murong Yi persuaded everyone to jointly choose to love the world, to give up their lives, to lock the demon, and once again fulfilled the promise of defending the world two thousand years ago.