Here I am going to say what I really like about the drama and what I dislike!
my
STORY: The story is actually amazing. I was hesitating so much before watching this drama because I am not a fan of computer science dramas but this one was once again amazing. I got hooked on it from start. I know there are some scenes that seem a bit childish but it gets covered in the deep story.

ACTING: Of course acting is one of the major factor for my rating. Every one of the actors and I literally mean everyone of the actor depict their characters very well.

MUSIC: Oh my! It was amazing. I really loved it a lot. the lyrics was very soothing with a bit of sadness and happiness.

REWATCH VALUE: I would love to. I am surely gonna watch this again.

OVERALL: I would recommend this to everyone including the ones whoa are not fan of hacking because there is more to it other than hacking. The emotional scenes, the scene of losing someone important to you and how it feels to chose between the person important to you and the whole country.

Here I end this review,
I know I used the word 'Amazing' a lot but this drama deserves it.
Also Sorry if there are mistakes in my vocabulary.