괜찮아요 (Gonna be alright) sung here by 유연 (Yu Yeon)
Actress is Seolhyun
The artist singing the official OST part 4 is - 오렌지 마말레이드 (Orange Marmalade)
Anyways onto the song! I love love love love LOVE Orange Marmalade the webtoon and i was afraid that the kdrama wouldn't live up to the webtoon's perfection (in my mind at least :P). But Oh My God am i glad i was wrong.
THE KDRAMA ORANGE MARMALADE IS AMAZING!
And this song that Seol Hyun sang at the end of episode 1 is just...perfection. I was just imagining what Baek Ma-Ri would've sung in this cafe scene and this is pretty much exactly it.
Enough of my crazed fan rambling.
Please enjoy :D
P.S. Oh i left the beginning bit in so that you could understand the context, he was angry and frustrated and then suddenly this angel of music reignited his passion once more :)