Kdrama/Movie OST

What is your absolute, all time favourite OST or the track that stands out most from a Kdrama or Kmovie?

It is hard to pick one.

I have most of While You are Sleeping's OST, I really like the 20 sec Zza zza con mi zza zza and 2morrow's Run from Beauty Inside and Badass Lee from Lee Min Ho's City Hunter and.... :)

Pinocchio : Every single day - Non Fiction,  Roy kim - Pinocchio

I hear your voice : Every single day - Echo

Reply 1988 : Lee Juck - don't worry dear 

Goblin : Lasse Lindh - Hush 

Strong woman Do Bong Soon : SURAN - Heartbeat , 

Chicago typewriter : SALTNPAPER - Satellite 

Because this is my first life : Moon Sung Nam - This life 

The time we are not in love : Every single day - Heart is going 

 I am a huge fan of the band "Every Single Day " , when I'm watching a K-drama  and I recognize the voice  of the frontman Moon Sung Nam I just get so exited. Their Ost are always my faves , just their music in general is amazing. 

Almost all the drama's in this list are in my top ten because of the ost. 

Search: WWW - Search by Elaine, Scent by Sam Kim, WOW by Mamamoo

Chocolate: Special by Yubin

A Korean Odyssey: Ghost scene (not sure of the singer), Justify by Super Sound

XX: Gotta Go by Sunmi, Fixx me by Jukjae,  Good day to love by Wyne

Angels Last Mission: Pray by Klang

Itaewon class: You make me back by Woosung

Strangers from hell: Strangers by The Rose

V.I.P: V.I.P by Kim Jun Seok

Flower of evil: Psycho by Doko, Feel You by Shin Yong Jae

The Tale of the Nine Tailed: Blue moon by Kim Jong Wan

The fiery priest: Hero by Norazo, Fighter by Jung Dong Ha, Paradise by Chin Chilla

Sweet home: Side by side by BewhY

Witch at court: Tell Me by Kim Bo Kyung

Doctor John: Way Back by Safira.K

Welcome to Waikiki: Waikikki wonderland by Ulala Session

There are many but the last one I liked was from Liar Game (I actually prefer listening to the instrumental track of it) I want more rock-pop OSTs like this one. In the actual song with the singing I love the whoaaa chorus parts but the rest of the song melody is so-so.. 

I combined the inst ver. with the whoa parts too for my own listening.