This "HI"carried a great sense of cold humor.
People often thought that ghosts carried great resentment and a kind of hysterical bitterness, which was an inherent impression of people.
Zhou Ze also thought so in the past, until he himself became a ghost.
How different were ghosts and people?
From the perspective of evil thoughts,
humans knew that ghosts were terrifying, and ghosts knew that humans were poisonous
From other perspectives,
ghosts came from humans. In many aspects, be it personality or senses, they actually had a deep sense of empathy with humans.