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Character A belongs to a group of assassins. The assassins kill 'bad' people who threaten others lives (murder type peopple). His parents were killed by this same group, therefore he was brought up by the elder assassins'. It's all he's ever known, and he is known for his quick style of getting his missions accomplished and being the best in the whole organizations.
Character B used to be the best of this group, leaving the organization when character A finished a mission that had been originally his, but he failed to finish it. One day B witnesses character A shoot a young girl who B saw to be not threat at all and decides to shoot at A. Big mistake. Because of this, A chases B down and is determined to kill B. But B makes a plan quickly and leads him to his home and captures A.
In the time period, the organization A belongs to can no longer contact A since B takes his cell phone and crushes it. B has a few things to say to A that may just change his life.