A man enlaved by the mob since childhood and raised into behaving like a human attack dog escapes his captor and attempts to start a new life.
      A man treated like a dog and raised as a fighting machine his entire life, ends up in a coma and is taken in the care of good people, but his sinister owner is looking to retrieve his most prized possession: a non stop human weapon triggered by the collar leashed on his neck.

by Jet Li play the hero , Danny has been living an inhuman , and never had a humane education . 4 years old, Danny was operating activities of illegal underground fighting gang leader kidnapped Bart ( Bob Hawkins ) . Bart told Danny he was an abandoned orphan on the streets . Since then , Danny has been completely isolated and was put on a collar like a dog , Bart like to be kept in the Office of the bottom of the mystery room , and accept the brutal training . He became the undisputed champion in the fighting tournament , Bart earned a lot of black money . Until age 30 , child mental Danny only knows its owner Bart , he was the small room as well as bloody and brutal fight . Moreover, Danny was trained as long as the master gave the order , rushed did not hesitate to kill each other killing machines . An accident car accident Bart into a coma , Danny encounter a blind Sam (Morgan Freeman ) , Danny world greatly changed . Sam natured old piano tuner, and know many secret underworld to kill . He and his 18-year-old stepdaughter Victoria ( Kerry Condon ) to live , they want to make Danny feel never touched before , and even banned the good of humanity and warmth . In friendship , love, patience , kindness , especially infection of music , Sam and Victoria try to make Danny to get rid of the previous long-term acceptance of violence education , and gradually find yourself . The gang leader would not easily let go of Danny , the two will face a bloody fight ... Danny can start a normal life ? Whether he would restore the old habits continue to be a killing machine ? Music can save a person ?