WOW!!
APPLAUSE!!!
I started watching this drama without knowing what to expect. I've never watched anything for Lee Byung Hun before so I was a bit discouraged.
BUT MY GOSH!!
I absolutely loved this!! The cast, the acting, the music, the directing, the outfits, the dialogue, not a single plot hole!
Every single actor played their character effortlessly and perfectly conveying the emotions beautifully! I was so immersed in the drama for 2 whole months.
The plot of the drama is not what I expected at all. I expected mainly a war/revenge focused plot, but it wasn't like that at all. It had friendship, romance, revenge, bromance, and war all executed perfectly.
I haven't enjoyed watching a drama this much in so long bravo!!

P.S. I watched the drama while it was airing two episodes every week on netflix and in my opinion that's one of the reasons I was able to enjoy it so much. It's a long drama with long episodes and so many things going on each episode. So for some people, it might be boring or too much.