I have to say that I really must commend the actors for the way they managed to showcase the transformation of their characters with the relatively short time scale of 12 episodes. It's not really something to be underestimated: I have watched good shows such as Once Again who have what I would consider stunning character development, but they had much more time to work with. Arguably they also had a larger cast of characters, so that also accounts for some of it. But still, it's not as if this drama had few of them: at least a couple of story lines besides the main one were pretty significant in terms of character development and plot. For shorter dramas, such as Somebody (which I loved despite it being panned in reviews), I feel it's more about the atmosphere. I do think that this translated, in this fic, in some characters that I wished were explored more, or some relationships towards the end that I wish had more "air time", and maybe were introduced earlier. But all in all, it was a challenging task to fit into 12 episodes.