This drama is just simply fantastic!! It hits all the right spots...whether humor,romance,emotions,action,mystery...everything. The drama is made very beautifully with excellent cinematography.The plot is very tight and you never get a boring moment anytime.The acting by everyone is excellent.Lee Seung-ki in the titular role is so good,especially in comedy scenes,he is simply awesome.Ha Ji Won in this badass role is very good as usual.But it's Jo Jung Suk who steals the show with his powerful acting and screen presence.Lee Yoon Ji is also really good.Not to forget Yoon Je-moon as the big bad guy,he also delivers a great performance. But it's not like the show is flawless..but they are very minute ones. The drama has a lot of heart..which is the most important thing!!