What are rich families called in Korea?

I'm quite curious about Korean culture, and I've noticed that in many dramas and movies, there are often scenes where wealthy families are referred to with a particular term. Could you tell me what this term is?" "I understand that in Korea, wealth and social status play a significant role in defining a person's identity. So, when referring to affluent families, is there a specific nomenclature that is commonly used?" "I'm also interested to know if this term has any historical significance or if it's just a modern-day expression. Could you elaborate on its origin and usage in Korean society?" "Lastly, I'm wondering if this term is widely recognized and accepted across all social strata in Korea, or if it's more of a niche term within certain communities or circles.