"Orange group" is "오렌지족"(o-ren-ji-jok) in Korean.
It means in 90s at Seoul Apgujeong (압구정), meeting girls and boy with the background of the economic strength of the parent and bringing brand goods, for example, riding around in sports cars and luxury cars. It is how the young people to the way of life to enjoy. Plenty of use pocket money at several million won, and being far from general young people, there has a negative connotation. Orange group, is the child of economically successful parents in the 80s from 70s.