This drama was addicting. I watched it completely in two sittings and one all-nighter. The story was a tale of how evil influences can break even the tightest of bonds. The two main leads, Lee Byung Hun and Kim Tae Hee, were fabulous in their roles. Their romance was burning with passionate skin ship scenes and care for one another. Their acting was emotion-filled and made me feel like I was actually there with them in the scene. I also enjoyed the partner relationship between the 2nd FL and the ML, which was actually supportive and caring without being overbearing. The script completely captivated me into this genre of action spy dramas. The action scenes were well-choreographed and packed with high adrenaline gun fights. The ending was tragic but fitting as it was nearly impossible for the ML to have a happy ending after pissing off the underlying antagonists throughout the series. The OST was great, but the cinematography was terrible with random screen zooms and shaky cam.