I finally found time to watch this. It was freaking wonderful... everyone did a great job. I am currently on episode 18, and I will undoubtedly give this a high rating.
Just finished it, and to those viewers that hated Gil Chae... You need to be in her shoes. I love the ending. It hurts but is realistic. They are both young in love, and this is the result of that. But maybe it will not be like this if Rang Eun is not obsessed.