1 Immortal's System

An immortal emperor who died and tried to takeover a person's body but right after he does that maybe he died because of accident or whatever but he got transmigrated and now have the glorious System as his golden finger.

Now you will have 2 path to take,

-the System is evil and tried to do something to MC by giving him false cultivation or whatever but luckily MC knows that it is wrong.

-the System has more knowledge than the emperor and the emperor felt some inferiority complex or smthng and tries to do his cultivation in his own way.

Its really up to you how u want to proceed w the story really