When you become a lonely ghost, his duty is to transfer you to the underworld and be reincarnated. When you become a powerful ghost and cause trouble, his duty is to make your soul fly away and annihilate, and you will never be reincarnated. You never know where they are, maybe they are your friends, maybe your family, maybe your lover...
Soul-traversing people, they are mysterious, strange and live among us like ordinary people. Are there people like this around you?