I just watched Stairs of Heaven, and I have one word to say: WOW!  
I never watched this drama before, so I really couldn't explain anything.  But once I did, I began to understand why this drama is so popular!
I've only watched four episodes of Stairs of Heavens and since I live
in America, it's going to be a little while before I get to see more of it.  But I still watch the tapes over and over again because the story is so interesting.  Everything about this drama was great.  The producing, the music (that's a big one), the acting, basically everything!  And what makes it even better is that their acting is so realistic.