Dao Heart and Demon

Three hundred years ago, an unprecedented melee between immortals and demons broke out. Both the immortal cultivators and the demons died. Three hundred years later, Qing Weizi killed the last demon in the sky. Since then, the world has been at peace, and there is no more rampant evil in the world... But many years later, a young man traveled alone through mountains and rivers to the fairy mountain where Qingweizi lived in seclusion, and asked for help to learn Taoism... What secrets are hidden in the body of this young man of unknown origin? Is he actually evil? In the dark corner, he showed a charming smile, his eyes glowing with bloody red light...