"Business partner" is "거래처"(kŏ-rae-chŏ) in Korean.
" Business partner " is called as 거래처 (Geo-Rae Cheo) in Korea.
The 거래처 (Geo-Rae Cheo), is compound of 거래 (trading) + 처 the meaning of "business partners" of things in (location). It is the Partner or Buyers that of the things want to trade, such as the continuing service.