Immortal Xuan Tianzun: I Am Actually the Reincarnation of the Demon Lord

I am in a happy relationship and have a successful career. Ever since that day I met a mentally ill person who said that I was the reincarnation of the Demon Lord. Since then, my career and love have suffered many setbacks. Before I collapsed, I traveled back to that strange world. The war between immortals and demons has caused chaos in all countries, but only the common people are suffering. Who can relieve the suffering? Ancient divine objects reappear in the world, ancient monsters are about to come out of the mountains again, and the sealed demon king is still strong. How much strife, bloodshed and killing will this cause. I originally wanted to live an ordinary life, but was pushed into the distance step by step by fate. Family, friendship, and love were constantly gained and lost, and eventually they became a generation...