I dreamed that I was a murderer in the afterlife in my previous life.

When people die, the soul leaves the body, but the soul has to be reborn. There are 10 life forms, from low to high: hell, ghost, beast, man, Asura and heaven; Lohan, Jue Yuan, Bodhisattva, Buddha. Among them, the first six belong to the "three realms" and are recurrent. In other words, the soul of the three realms should constantly cycle in the six realms. If you have higher aspirations, you will become a saint if you jump out of the three realms and get rid of the six divisions in the wheel of karma. Neither life nor death, but endless life. Past lives set this life, and today is the afterlife.