I gonna give my reviview about the story, acting and music.
Story: The plot is not typical and that is good however I think the drama is so confusing, maybe cuz there are many stories . And that is a little tiring.
Acting: Rain is a multitalented guy, I could feel his charater's pain. His action scenes were really good here. Along with Lee Sun Bin showed a really good chemistry.
Lee Doong Gun as always he was amazed. In this case as Kim Do Jin I can felt his revenge and his
ache. His action scenes were good too.
About Lee Seung Joo just can say that he was phenomenal, he did a really wondeful job in this drama, excellent acting.
Jung Jin Young, I think as actor must be dificult to confuse the audience and he did it with me. Also I can felt his character's sadness. He is a superd actor. Outstanding acting here.
The music was really good and fit well with this drama. Despite sometings I particularity enjoyed this drama so much.

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