Since I have over 2,000 Korean songs in my iPod and I've been receiving lots of compliments from my fellow k-poppers about my music, I will list my suggested songs that is not too mainstream so other fans could enjoy songs that they might not have heard before ^^ (but I'm sure that you will recognize at least one song)
My favorite heart-wrenching ballads:
1.) Lee Seung Chul (이승철) - No One Else (그런 사람 또 없습니다)
2.) Baek Ji Young (백지영) - Like Being Hit By a Bullet (총 맞은 것처럼
3.) Kim Yeon Woo (김연우) - A Common Phrase Like "I Love You" (사랑한다는 흔한 말)
I know that there are TONS of playlists out there, but PLEASE give these songs a try and you won't be disappointed!
HINT HINT: Read the translations of the song! The lyrics are sooo meaningful ㅠㅠ