From Wiktionary, the free dictionary
던데 • (-deonde)
- Equivalent to 더 (-deo-) + 는데 (-neunde). See there for more.
밖이 시끄럽던데 무슨 일 있나?- Bakk-i sikkeureounde museun il inna?
- I noticed it was noisy outside; is something going on?
날이 좋던데 어디 놀러 안 갈래?- Nar-i joteonde eodi nolleo an gallae?
- I saw that it was nice outside, why don't we go have fun?
이러다 금메달도 따겠던데?- ireoda geummedal-do ttagetdeonde?
- At this rate, it looked like they were going to get the gold medal!
