They could have done so much more with this. I feel like there were major gaps in the characterization. It might just be a result of the manga that it's based on, but I didn't get a clear view of the characters' mindsets really... I dunno. The acting was pretty good as far as I could tell. I mean the actors didn't really have that much to work with, but they did well. I thought Dongho was actually very good. Someone compared him to Kristen Stewart- maybe just because his character is sort of like that. He seems really dead inside for reasons we never really get. That's something i wish they would've delved into more deeply. I would have understood Yoo's motivation to keep fighting more if we really got a look at his background, his father, his home situation. The music was pretty badass. Definitely one of the best parts of this drama.