I love East Asian music, i even have some of my favourites on my profile but the OSTs for Uncontrollably Fond WITH English subs (if possible) that are my favourites are marked with an Asterisk below. What is/are your favourite/s ? xD

Korean

Ring my bell - Suzy *
Say Goodbye - Kim NaYoung *
Finding difference - Kisum & Seulong *
Only U - Junggigo *
I Miss You - Hyolyn (Sistar)
Picture In My Head - Kim Woo Bin
Don't Push Me - Wendy & Seulgi
Don't Push Me (Ballad Version) - Wendy & Seulgi *
From When Until When - Tei
I Love You - Kim Bum Soo
Love Hurts - Hwanhee
My Love - Honey G
Rain Shower - Eric Nam *

English

A Little Braver - New Empire *
Across The Ocean - New Empire *
Midnight Youth - Golden Love

& ENJOY ! to those that were not bothered to find these out themselves! Took me awhile to find them all specifically like that xD
Before i start, i want to say that's this is really difficult to choose favs from all those amazing ost. 
My favs are
I Miss You - Hyorin
Don't Push Me - Wendy & Seulgi
Only U - Junggigo
Say Goodbye - Kim NaYoung
Ring My bell - suzy
I Love You - Kim Bum Soo <33 JUST PERFECT
The most beautiful and fitting for a drama were from Kill me Heal me and Hana Yori Dango main theme
One nice feel good song from Cunning Single Lady
Love songs from Hana Yori Dango And Okitegami Kyoko no Biboroku
A nostalgic song from Gokusen
and a nice powerful song from GTO
and many many more of course
All the songs of this drama are very good.
I can't stop listening this one:
Do You Know - Kim Woo Bin (Uncontrollably Fond OST P.6)
maybe because of Kim Woo Bin ;)  <3 
my second favorite is:
A Little Braver - New Empire 
I'd have to say A Little Braver - New Empire.
The lyrics are so fitting to the story and it's a really beautiful song.