Build a movie plot around this: Why does Casper keep his romantic involvement with Martha a secret? Fears for her safety
The answer to this question is:
Willy, nicknamed El Casper, is a member of the Mara Salvatrucha gang and lives in Tapachula, a Mexican town near the border with Guatemala. He introduces a young boy into his gang, and the boy is given the nickname Smiley after a violent initiation. Casper later helps Smiley to complete this initiation by helping him execute a rival gang-member. Casper is romantically involved with a girl, Martha Marlen. Fearing for the girl's safety, he keeps the relationship a secret from his gang, but his double life causes his gang to doubt his loyalty. When Martha follows Casper to a gathering of his gang, the gang leader, Lil Mago, escorts her out, despite Casper's misgivings. Mago attempts to rape Martha and accidentally kills her. Later, he blithely tells Casper that he will find another.Shortly afterward, Mago brings Casper and Smiley to La Bombilla, a location along the train tracks where potential illegal immigrants stow away on passing trains on their way to the United States. Among the immigrants is a Honduran family introduced earlier consisting of the teenage girl Sayra, her father, and her uncle, who are on their way to relatives in New Jersey. Lil Mago, Casper, and Smiley rob the passengers for any money they have until Lil Mago spots Sayra and attempts to rape her. Casper intervenes, killing Mago and then sending Smiley off.Smiley goes back to the gang and reports about Mago's death. The new gang leader, El Sol, accuses Smiley of collusion, to which Smiley timidly protests and begs to be sent to kill Casper to prove his loyalty. El Sol agrees and Smiley travels north to track down Casper. On the train, the still shocked Casper is avoided by other passengers. When some try to throw him off the train, Sayra warns Casper and keeps on approaching him, despite her father's warnings. Casper's knowledge from previously smuggling gang members and avoiding the police proves useful, as he eludes his pursuers. He is finally accepted by Sayra's family but decides to leave the train while the others are sleeping....