I really enjoyed this drama. It was full of suspense, and excitement, and each episode kept me on my toes.
I like how complex the main lead characters are, like for JM I couldn't tell if he really was going to turn to the dark side???

I like the dynamic friendship between Jun Mo and Gi Chul. They became good friends, and I believe that Jun Mo viewed Gi Chul as his friend, while he was undercover. Like JM can see GC is not a bad person, but he makes poor choices and chooses a bad life. When Jun Mo lets GC go in the last episode, I can see that Jun Mo cares for Gi Chul.

Most of the side characters were good, and I liked their performance as well.

I think the ending was good and satisfying. There really wasn't anything bad I can think about it like GC needs to pay for his crime, and he did that by wanting to kill himself, but JunMo killed him instead. Also, I think the wife was conflicted between Jun Mo and Gi Chul. I think she still holds some nostalgic feelings towards GiChul, which could explain why she never threw away the cross necklace that GiChul gave to her.

In the end, Jun Mo and his wife ended their relationship; kind of sad about it; but there's just too much so I guess divorce is best for them.

I like Haeryung and her bodyguard. He is loyal and committed to protecting HR. I wish they could have ended up together.

In the end, Junmo gets promoted and successfully completes his undercover task, but in the end; he is left with no wife and loneliness. He ended up befriending with GiChul, and in the end, he lost his friend as well as his wife.

So who is really the worst of the evil?????? Or maybe it's no one, that's for you to figure out :).

Overall 8/10. 9/10 for JCW and WHJ's bromance :)!!!!