I do not really know if it is a spoiler or not but this drama for sure is not for people who do not like brutal scenes, there are quite a lot maybe not so much visually but still. Also it is a pretty bloody. So not for everyone even if you love the cast.
And if talk about th cast it was perfect, Seo In Guk was amazing, Park So Dam was so good, everyone played their roles perfectly.
I do not really think that we can treat as a two seasons drama, it is more like there was just a short break but it is not that important.
This drama is good, with excellent cast and very good OST.