Something's weird with the summary but anyway it was already mentioned before. I thought this drama/special (call it how you want) was really good, because it talked about something important in our society. I thought it would be light, but it was actually serous. Yet it was also beautiful and gives hope, and that's what makes it beautiful. Lee Jong Suk and Jun Ye Seo's acting are also really good and the ost is really beautiful. I also think it has a good rewatch value, because it can make everybody understand new things :) The story is not only about illness, nor love. It's about relationships between people, and other deep values of our society. I advise you to watch it, but be ready for the feels!