Manwol's feelings are just scorn. Scorn for the girl for having killed her classmate. Scorn for that girl's parents who only want to cover up her crime. So it's justice, in a way, that these parents ended up killing their daughter's soul.

Now that her soul is gone, that just leaves her body for the ghost who's currently possessing it. The ghost of the girl who was murdered, and had possessed her murderer in a fit of rage, now doomed to continue living in that body for the rest of her life. But that too, feels like justice. Everything has a price. She possessed her, and now she has to live with those consequences too.

Maybe she'll live a better life, despite that.