This is a Fanmade MV
Song : Ha Roo Ga Noon Mool Ee Jyo (Saxophone Version) By Mark Douthit
Clips: Jong Soo and Jung Won’s Scenes From K-Drama “Cloud Stairway”(KBS-2006)
I like the saxophone version of this OST as same as the vocal version. The music is really nice one.
Mark Douthit, who played this song, is an US musician.
Having read about his bio, I learn that he has been worked with so many famous musicians, such as Elton John, Amy Grant, Billy Joel, Whitney Houston, Michael W.Smith, and many more.
More about him can be found in his website: Mark Douthit