Revenge drama. A lot of action, fast storyline, and really brutal. And unpopular I did not like it, in my opinion it get stupidly overhyped. Yes, acting was not bad, in my opinion Kim Ji Hoon was the one who stole the show.
It was supposed to be brutal - so it is not a problem. A lot of action also make sense. Maybe fast storyline was just too fast? Cause we could not really get to know characters. And as far as people love Jeon Jong Seo's acting it did not click for me - and maybe that is why I did not like it as much as other, her character felt actually soulless - and it makes sense for revenge but it did not work for me.