First, I am Caucasian.
I went to a Korean grocery store, and the owner or an employee followed me every step. She did not say anything to me at all, and I said nothing to her either. I got spooked and left without buying anything. When I told a Korean friend about the incident, he told me that the person was just ensuring that I found what I wanted. It's hard to understand other cultures. I'm not sure I believe what my friend told me either.