Close Enemies

This story is about two children who were kidnapped by terrorist after their parents were killed, and they were trained to become killers and assassins, before they were saved by the military, but only one of the child was saved, and he vowed to reunite with the other sibling, not knowing the other was already established by the world as a notorious unidentified Assassin known as "The reaper". After finding out they have to choose between family and the world.