-(으)ㄴ/는 반면에

whereas, on the other hand

Explanation

This expression is used to express the fact that two things are opposites.

It can also be used to state both the positive and negative characteristics of something together in the same sentence.

It can be used with the particle 에 or in the form -(으)ㄴ/는 반면.

Details

When the preceding and following clauses represent opposites, the form -(으)ㄴ/는 데 반해 can also be used.

그 집은 비싼 데 반해 주변 환경은 별로 안 좋은 것 같습니다.
That house is expensive, but on the other hand, the surrounding environment doesn't look very good.
요줌 수입은 증가하는 데 반해 수출은 감소하고 있습니다.
In contrast to the recent increase in imports, exports are decreasing.

Kimchi Reader

Used to show that two clauses are contrasting or opposite to each other.

Examples
이 보고서는 이해하기 쉬<span class='focus'>운 반면에</span> 다른 보고서들은 복잡합니다.
This report is easy to understand, whereas other reports are complex.
서울의 날씨는 추<span class='focus'>운 반면에</span> 남쪽 지방은 따뜻합니다.
Seoul's weather is cold, whereas the southern regions are warm.
이 도시는 밤에는 조용<span class='focus'>한 반면에</span> 낮에는 매우 붐벼요.
This city is quiet at night, whereas it's very crowded during the day.

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