I have around 200 KDramas under my belt by now, and I have rewatched quite a few of my favorites as well. Sandglass is one I will revisit at least once, and very likely more, in spite of the fact that it is frequently gut wrenchingly painful. It is also brilliant, one of the most meaningful ones I've seen, if not THE most meaningful. I was very happy to learn about this period of Korea's recent history, though I had already touched on it with the movie "A Taxi Driver." The three leads in this story were simply brilliant, especially (for me) the guys - they simply blew me away, leaving me weeping real tears, which almost never happens when I watch anything. At any rate, the writing and acting and even the music were fantastic and I can't recommend this drama enough.