If you are looking for a crime based thriller Kdrama then this is for you. The casting was top notch and every character played it's role phenomenally . But for me Ji chang wook stole the show. Every scene, dialogue delivered by ji chang wook was to the point, and once again he proved how amazing he is an actor. Talking about the story it gave the viewers a glimpse of how illegal drug trade was prominent in 1900's in sk. It also gave audience a brief view on how undercover agent/ cops suffer mentally, physically while dealing with criminals and how their personal life gets entangled when family members gets involved. This is not a typical romantic kdrama where FL will end up with ML in the end. Talking about the music the music was good . Honestly the ending was realistic because Jun moo realised that how things can get messed up if family members get involved while dealing with criminals. And as for the chemistry between the leads it was good but the FL character lagged because she too much involved her personal feelings in the investigation and completely forgot that the SML was a literal criminal and she didn't even saw that the very end also the SML didn't regretted over his wrong doings. The reason why Jun moo shooted Ki Chul was he didn't wanted him to die through sucide because that would be a easy death for him. The SML wanted to die to let jun moo suffer mentally thinking that Jun moo will feel remorse and regret over his betrayal but Jun moo shooted him to show him that at the end justice wins and cops will always punish the criminals whether they have personal feelings or not. As for Jun moo and Eui-jeong relationship it was quite clear that Eui-jeong didn't loved her husband and more importantly respected him as a cop she was literally shocked like what did she expected from Jun moo to let a criminal win ? She shouldn't be call as a cop because she let her personal feelings for involved while punishing a literal criminal and it looked like she was not true to Jun moo her love was more for Ki Chul because of she loved Jun moo she wouldn't have lied to him about the necklace nor she would have kept the necklace. The ending basically tells that Jun moo as a cop would probably start his life fresh without the lingering feelings or memories of the past. A 10/10 drama for me!!