Which nation does the ghost refer to?

The word "ghost guy" is a common language used to address or describe white people in Cantonese, which is also the "foreign devil" in Mandarin.

The word "Ghost Guy" came into being because modern Cantonese believe that most white people who invaded China from overseas have red hair, red beard and green eyes.

The word "ghost guy" is actually a slightly derogatory term for whites.