According to the research held in 2000 , the number of In clan of Yonan 's member was 588 .
Their Bon - gwan is in Yonan County , Hwanghae Province .
According to the research held in 2000 , the number of In clan of Yonan County 's member was 588 .
Their Bon - gwan is in Yonan County , Hwanghae Province .