K "The Master"
About
A legendary boxing trainer, having raised 5 boxing world champions. He is currently training Yu.
K has a strong personality and he relies extensively on his instinct and gut feelings to guide his decisions, noting himself that he has always lived in such a way .That said, his intuition regarding others is usually correct. K has an underlying child-like streak, such as his immense excitement when things go his way. At one point, he was so keen for Yu to join him, K genuinely thought about kidnapping the student and taking him with him.
K's past, where he was a promising boxer but decides to pursue a career as a soldier, where he quickly stands out. In his first mission, he manages to rescue a civilian and among them there is a boy who is impressed by K and promises to be a great soldier like him when he grows up. But in a later mission , he met that boy again but this time... they are both in the opposite side and he has killed him. That haunts him and when during 1 mission that they inform him that his wife and his son died in a traffic accident hit by a truck that failed their brakes at a junction. The driver was sentenced to probation and in K's words "something changed inside him." marking the turning point for him to become an insane man.
In one of the mission , he saves Carmen.
J's boxing is a "denial of K" according to Bob Norris and that is why J and K are nemesis to each other.