Watch John Wick
A hit man has lost everything, and he is at the point of considering why he should live another day. A number of years go by very quickly, and this hit man still remembers what happened to him and the people that did it. After getting himself together, the hit man takes matters into his own hands and goes after the people that got the best of him. The hit man will not stop until all of his enemies are dead, and he will put his life on the line every second of every day if it comes down to it.
The hit man ends up being faced with some crucial decisions. He may be able to live a life of peace, but this may require him to let his enemies live their lives. He also wants to find love, and he does not want to jeopardize his love because of past situations in his life.