This is one of the most remarkable series i've ever watched.
The main character doing all that for his friend Soo ho and Beom Seok is what real friendship means.
Beom Seok being a traitor is really shitty after all they did for him.
There are alot of fights and blood so it's not recommanded for those who don't like blood, but overall it's a really good kdrama.
This is a 10/10 rated kdrama and you gotta watch this if u love revenge, friendship, action, and hope.