BTOB - Father
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Oops here's the video for Father
The TRAX - Over the Rainbow It doesn't matter if it's the Rock or Piano version, I think this song is really beautiful and touching. I love it. :)
Haru Haru by BIGBANG
Mine would be: FTIsland: Missing you; You'll be in my Heart UKISS: 0330; Take me away; Someday Ulala Session: Goodbye Days (from Bridal Mask) Yesung: Love Really Hurts
Mine would be Ugly by 2NE1 because I feel like this all the time.

A Song For You by FT Island

Bie Shuo Dui Bu Qi -S.H.E (Taiwanese version of Everytime by Britney Spears)

The Beautiful Name by Alice Nine
That I Was Once By Your Side - Jang Wooyoung


Crush - Sandeul



Forget Our Memories - Kevin


Let it Rain - Nichkhun -> Not really touching but a really awesome ballad <3


I love those song the most <3
My choise is Seohyun - It's Okay Even If It Hurts (Kim Soo Ro ost)

https://www.youtube.com/watch?v=sOSi0I_3EAc
I'm not a fan nor an admirer of Coffee Prince but the first time i heard this song, it stays on my mind since then. They barely played this song in CP, so i don't know if some of you remember this:

My heart is cursing from You're beautiful and the ost of city hunter "Suddenly" kyaaaaa ^^"
Here is a video for it, darn KBS for blocking most of them... It's a cover of Boohwal's The More that I Love you sang by Yesung of Super Junior, even after over a year it still touches me..
FT island - love love love
"I Have a Lover" - Lee Eun Mi is one of my favorites. It's the song that brought me into Korean music outside of OST's.
Kim Hyun Joong - Love (Ballad Cover)