Similarities between this and The Green Mile
Prison movies written by Stephen King and directed by Frank Darabont, with music composed by Thomas Newman.
Period dramas set in the early-to-mid 20th century.
Each film has a main character who is revealed late in the movie to be wrongly convicted.
Each film is narrated by a character whose life is profoundly affected by the seemingly magical qualities of the innocent prisoner.
Each has two main villains--one a guard, the other an inmate.
In each film the inmate villain is punished by the sadistic guard, who is himself later punished by being lawfully detained in some way.
*For that matter, in each movie the sadistic guard kills two prisoners.
Each film has at least one sympathetic(though presumably guilty)prisoner who meets with a tragic end--i.e. Del in The Green Mile and both Brooks and Tommy in Shawshank.
Each film ends with the narrator making some reference to how his life now feels like a journey and not knowing how or when it will end.