-(으)ㄴ데(요)

but / although (background)

TOPIK 2

Gives background or soft contrast before a follow-up: 'but / and (you know)'.

Examples

유언장은 내용을 바꾸려면 새로 써야 하는데 유언대용신탁은 그런 불편함이 없다.

Wills are inconvenient to update, as the entire document needs to be rewritten if changes are desired. Will substitute trusts, on the other hand, are more flexible in this regard.
Utilizing Testamentary Trusts for Longevity Planning →
나는 언젠가는 프랑스에 꼭 가야되는데, 그게 언제인지는 모르겠어.

It is inevitable that I go to France someday, I just don't know when.
Source: Tatoeba #5385
안녕하세요,예약을 했는데요, 제이름은 카오리 요시카와 입니다. 확인카드는 여기있습니다.

Hello, I have a reservation, my name is Kaori Yoshikawa. Here is the confirmation card.
Source: Tatoeba #1123385
너와 이야기 하는 것은 정말 좋았는데, 근데 진짜 가봐야 해.

It's been nice talking to you, but I really must go now.
Source: Tatoeba #8361876

Articles that use -(으)ㄴ데(요) in context — open one to read it in full.