In the Dream, I Don't Know That I Am Not a Guest

Life is rare, thoughts of death are impermanent, cause and effect, karma, and reincarnation are the faults. People will not be left with nothing after death. People who are too resentful for a wasted death during their lifetime will leave behind a strong trace of resentment, unwilling to leave and escape into reincarnation, and stay in the world to take revenge on future generations. However, the souls of the dead who do not want to leave but still have memories left in the world will leave behind a trace of obsession with someone or something in their hearts. So what is your obsession?