Ghosts with strong obsessions may be trapped somewhere in their lifetimes, addicted to past memories and reincarnated over and over again;
Or this may give rise to resentment and be dominated by resentment, and then lose oneself and become a vicious ghost with no sense at all.
What Li Feng has to do is to calm down the ghosts' grievances, eliminate their obsessions, and finally send them into reincarnation.
Purpose: to resolve grievances and resolve grievances