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에 대해서는

as for

→ 에
phrase Uncommon #14,647
as for Marks the topic as something the speaker is discussing, often with a contrastive emphasis. 에 대해선 is a contracted form of 에 대해서는.
KO: 이 문제에 대해서는 아직 잘 모르겠어요.
EN: As for this issue, I don’t know much yet.