What an excellent drama!

I was hooked to this drama. It was dark, gritty, and brutal.
The plot of this drama essentially focuses on the cat and mouse chase between a "criminal" and the cops.

Hwang Kyung-min is a taxi company CEO who is on a mission to extract revenge from those who bullied him in school. In the process he contacted Jung Jong-seok who was his friend in the school, and now a cop.
The rest of the drama focuses on uncovering the truth behind the death of their third friend, Cheolie, and how Kyung-min takes his revenge, closely followed by Jong-seok and Kang Jin-ah, another cop.

What I liked about this drama is the brilliant narration style by the director Kim Dae-jin. Every episode ended with a cliffhanger, which is not rare, but what made this part is the tone at which the episode ended. In particular, I liked the 10th episode. It revealed so much, and it was great how the event were built to come at that moment. Again, this is the brilliancy of the director.

The actors of this drama were amazing. Each and every one had done their job perfectly, in particular Kim Dong-wook. I don't have enough words to praise Kim Dong-wook's acting in this drama. He was expressionless while killing his bullies, but at the same time his eyes carried that lingering pain.
The child actors too were brilliant. To act so extraordinarily speaks a lot about their talent. I hope they will have a bright future ahead and hope to see them in other dramas soon.

OST of this drama, even though wasn't much diverse, it was spot on. I particularly liked the theme music that played in the background, the one that played during the start of last episode.
The cinematography was dark, which perfectly complemented the tone of this drama.

This drama was so much more than just another revenge drama. It explores how the certain events can forge the future of kids. Bullying is a widespread problem in South Korea and one of the main reason for that is because of the inefficiency of schools to come up with a system to eradicate such problem. It's the duty of teachers to ensure that no child is hurt in the school. And yet, some teachers ignore the bullying in their class, which in turn destroys the life of the kid who is being bullied.

This drama shows too polar opposite humans. One who was bullied as a child and that affected his adult life. And the others, the bullies, who continues to live as if nothing happened.
While I condone the violence and murders, but I can't help but root for Kyung-min. This is the brilliancy of this drama.

Amazing drama. I will highly recommend it.