Transmigrate to the Tang Dynasty: The Demonic Path

What do you do when you suddenly transmigrate to ancient times and encounter ghosts and monsters? You get a System, only to discover it's a villain? The Taoists have all been wiped out by the Buddhists? There's a Ghost King up ahead? Your friends join forces with the Ghost King and stab you in the back? No problem. One punch breaks through all arts, and you can travel the world without fear!