does it have egg in it?
YEP!!
its like egg-corn soup? its not that simple and it's hard to describe what it really is.
It's a starch thickened corn soup (sometimes made with chicken broth) where eggs are dropped in and allowed to form ribbons.
There's so many variations because it's really easy to make, so a lot of Chinese restaurants had some variation of it.
I likely regularly had a Hongkong variation which was basically as described, but made with chicken broth, and wasn't starch thickened, and fit in nicely in the 港式 cuisine, despite egg drop soup likely originating from Northern China.
EDIT: PLS READ: corn seems to be optional.