-(으)ㄴ/는데요 is also used to express the expectation of, or waiting for, a response from the other person and corresponds to '...and?' or '...but?' in English.
Details
Kimchi Reader
It can be used to express the expectation for a response from the listener.
Details
Expressing disagreement
Usually expressed in an answer (think of this example as 2 person dialog):
오늘 날씨가 안 추워요. 저는 추운데요.
The weather isn't cold today. But I'm cold.
여자 친구가 정말 예븐데요!
Your girlfriend is really pretty!
한국말을 아주 잘하시는데요.
You speak Korean very well.
Examples
오늘은 좀 <span class='focus'>바쁜데</span>...
Today is a bit busy...
제가 머리가 많이 <span class='focus'>아픈데</span>.
My head hurts a lot.
<span class="speaker-a">A:</span> 여보세요,거기 하영 씨 댁이지요?<br><br><span class="speaker-b">B:</span> 네. 맞<span class='focus'>는데요.</span> (누구세요? / 무슨 일이세요?)
A: Hello, is this the home of Hayeong? B: Yes. It is... (And you are? / What is the reason for your call?)