Over the centuries, the Korean peninsula has developed as a fairly homogeneous, singular nation with one shared cultural identity. That identity is one largely defined by its location, pinned in between the ancient giant of China and the rising sun of Japan. Korea follows, generally, a traditional Confucian approach to family, with a close-knit patriarchal family structure. In recent years, western ideas on the family have worked their ways into the folds of Korean society, and women have gained a greater degree of social power.
Currently, there is not any minority cultural group within Korea, so none are in danger of going away. The main cultural struggle is one of conservative older generations versus newer, liberal generations trying to introduce more western ideas.