As a Norwegian, I loved this drama, but: No, thunder does not happen during the winter! And you will not die in such a light snow... But other than that, this was a beautiful drama.
I mostly agree with you, though I would go a couple of stars up. What I actually struggled the most with, is that why on earth did I get hooked? If I keep it logical, it wasn't bad, but I didn't really care for any of the characters (or maybe Gwi, as you said, he was more interesting), and the story was boring. But I just HAD to continue and finish it... I have no explanation as to why though!