Reborn to Slay Demons and Become a Demon King?

Li Haoxuan passed through and became the Holy Son of Heaven. He originally wanted to live a luxurious and luxurious life, but unexpectedly he was ordered to go back in time just a few days after taking office. He was forced to travel back in time to kill the Soul-Eating Demon Lord who had not yet embarked on the path to immortality, and save the world. In this world where ghosts and gods dance around and demons abound, he originally wanted to stay in Xiuzhu Peak until he becomes an immortal, and then think about other things. Until one day... His master was so quiet that he accepted another junior sister for him... Only then did he realize that by some mistake, he had become the Demon King himself!