He & She in Korean
Actually we don't use 그&그녀 in real conversation but use these words in the book or something like that sometimes.
We use his/her name to express/explain something.
so... he is a taxi driver would be 철수는 택시 드라이버다 , she is a nurse -> 영희는 간호사다.
or we use 그 사람, 그 남자, 그 여자, 그 애, 그 할머니, 그 아저씨, 그 아줌마.. when we don't know his/her name in conversation