Story:
The story itself is pretty good. After going through the misery and tragedy both protagonist and villain chose different path to walk on, and that led this drama to go on. One walks on the path of justice and other creates his own reality after getting betrayed by the nation which strangles him down.
I liked how every episode ends with suspense which holds your mind to keep going on

Acting and cast:-
The Nam Goong Min shows never really disappoint, this goes same with this show too...except his "weird walk" which I can understand after going through a lot of training. And not to forget that, this is a action packed drama, so you get pretty good action scenes but the number of scenes are very few.

Ost:-
I liked the ost played at the end of each episode.

Overall all I got satisfied with this one. Might have next season coming too..! I liked yoo je yi's trust towards her sunbae and how he finally got a reliable comrade! Give it a go if you are looking for action, thrilled mistery drama.

Please let me know about any mistakes!. This is my first review and I didn't really have any idea how to write a proper one even after reading so many of yours.
Thank you!