Treacherous Mercenaries -japanese movie

Title: Reborn (japanese movie) tells the story of a mercenary nicknamed "Ghost" (Tak Sakaguchi) who works under the leadership of a General named Phantom. One time Ghost got the job to kill a family. When he had to kill a child named Sachi, Ghost was not willing to do it, and chose to run away. As a consequence of his actions, Phantom thinks Ghost has betrayed him and he must die.