All in all this was a very enjoyable series. The acting was phenomenal, the story was interesting and the characters were complex and likable.

I have always liked character-driven stories more than plot-driven stories. I would rather stay with a bad story with great characters than a great story with bad characters. The characters in this drama, especially Kim Min Joon, were the reason I loved this drama so much. The story can be a bit slow at times and I didn't really find the villains all that interesting, but the main team makes up for that. This story does have quite a lot of political elements that some people might like, and some people might not.  It does slow down the drama a bit, but not for long at the time as they have some sort of action in every episode.  

The acting was done very well, especially by our two main leads. Both of them are able to portray the main characters as the complex characters they are and have great chemistry with each-other which is why their relationship works so well. Their slow-building friendship is one of the best things in this drama.

If you enjoy watching a team of complex characters working together to fight a common enemy, a bit of action and an overall serious drama (with a a little comic relief here and there) you should try this one.