Favorite Korean Drama OST?

Something happened to me & Because I'm stupid FROM Boys over flower
Reset & Fly with the wind FROM Whor are you - school 2015
Bobby Kim sang (don't know the song name)  FROM Doctor Strangers 
Alive  FROM Moorim School 
All song FROM Dream High 
Goyeo FROM Warrior Beak dong soo 

My Favourite Drama OST's are :

Who are you : School 2015
Empress Ki
Secret
The Princess' Man

Reply 1988
It's Okay That's Love
Cheese in the Trap
Descendants of the Sun

Auditory Hallucinations - Jang Jae In (Kill Me, Heal Me OST)

Mask - Kyun Woo (Liar Game OST)

And all of the OST's of The Master's Sun, dangggg perfection! XD

I think i love you - Fullhouse
Dream High OST
You are beautiful - Promise You, Without Words
You who came from the stars - Lyn - My destiny
You who came from the stars - Hello, Goodbye
Pinnochio - Every single day - Non Fiction
Boys over flowers - Because I'm stupid, Almost Paradise
Heartstrings - Kang Min Hyuk - Star
The Heris - Lee Hong Ki - I'm Saying

Touch Love (Master's Sun)
I Think I (Full House)
I'm Coming To You (Queen Inhyun's Man)
너에게 퐁당 (Splash Splash Love)
As Life Goes On (High School King of Savvy)
Someday & Maybe (Dream High)
Losing My Mind (My Girlfriend is A Gumiho)
Perhaps Love (Goong)
Atlantic Princess (Monstar)
You (Healer)
That Man (Secret Garden)
Growing Pains 2 (The Heirs)

Everything from it's okay it's love

The Master's Sun - so far I haven't heard anything that bests it.