How can people know the underworld among the dead?

1, you can find a psychic (certainly not a liar). You know it's more spiritual through the ghost of the dead.

You can ask the dead to give you a dream at the grave, but it depends on everyone. Some people are better at dreaming, and some ghosts can't dream. Be careful not to put anything in the room that can pretend to be a ghost.

However, I personally don't think this secret can't be revealed. People who are more accurate in fortune telling are generally blind. Why? Because they let the cat out of the bag, there will be defects.