The acting carried this drama. Namkoong Min steals the show in this series, delivering a powerful performance that keeps the audience hooked from beginning to end.

The problem with Jamie Leighton, don't live up to their special roles, feeling like regular officers rather than FBI or special agents. On god, she is just a burdened for everyone. The way Do Jung Wo dodges capture doesn't seem realistic. In this world, even thou he is a serial killer, you would think that his face would be everywhere in korea, but nope, he can just go anywhere he wants. And Jae Wong's Arc just sort of fizzles out without a satisfying ending. After his multiple identity merged together, he became nobody, and just a "Third child".

The Glass Fake Hype. I though DJW need that glass to have an insane focus inside his brain. They introduce this mysterious glass thing, and you think it's going to be a big deal. But nope, it's just a virtual reality tool for the bad guys to have the formula. It could have been cooler, especially for Do Jung Wo's plans.

The story is good, but it gets bogged down in places. Trimming about three to four episodes could have kept things moving along without unnecessary stuff getting in the way. The last episode feels rushed, cramming in too much at once. If they had taken a bit more time in the last two episodes, the ending could have been stronger and more satisfying.