사안이어서

In a sentence

• 이 문제는 긴급한 사안이어서 모두가 주목하고 있습니다.

  This issue is urgent, so everyone is paying attention.

  Here, '사안이어서' indicates the reason why everyone is paying attention to the issue - the issue's urgency.

• 그는 이 사안이어서 회의에 참석하지 못했습니다.

  He couldn't attend the meeting due to this matter.

  In this sentence, '사안이어서' is used to convey that the matter is the cause for not attending the meeting.

• 이것은 특별한 사안이어서 신중히 다루어야 합니다.

  This is a special matter, so it must be handled carefully.

  Here, '사안이어서' explains the reason for careful handling by stating the nature of the matter.