Even though we are one of the 6 billion people in the world, we are always regarded as ghosts for no reason. This can be regarded as a kind of super power! If given a choice, I would sell this ability to support myself, after all I am just a cheapskate. On the contrary, my tenant was obviously a ghost, but I always thought he was a human being and lived with him under the same roof. It was not until a chance encounter that I discovered his true identity.