Guests in the Hall

People in the village call my grandma "Grandma Huang". It's not that her surname is Huang, it's that she has a "guest" with her. After the guests come, grandma can cure diseases, connect yin and yang, and talk to "over there". People who come to grandma for medical treatment, and the hospital can't find anything wrong with them, can just come back and let grandma take a look at them, and they'll be fine. But after recovery, some people will talk about their deceased relatives, and some people will say, "I'm so hungry and cold down there." I grew up listening to this and didn't think it was unusual. Until I grew up, I discovered that my grandma would stay in the main room all night every year on my birthday. My mother said, that is called "paying one's wish". I don't know what I want in return. But when grandma whispered, she repeated one word—— "Return." If something is borrowed, it must be returned. I just don't know, it's me. (This story is purely fictitious, and the folklore involved is only needed for literary creation)