What is a domestic ghost?

People in the family who secretly do bad things.

The word "mole" refers to some people who secretly do bad things at home, based on the trust of their families, and in order to achieve their goals, they destroy things at home at will and do things that hurt their families.

Domestic ghosts generally refer to people with bad conduct or serious deviation in behavior, and generally refer to bad people who cause serious harm to their families.