A gritty Chinese drama in competition at the Cannes Film Festival explores the clash between generations and grim life in industrial hinterlands where millions of families were forcibly moved in the 1960s. The director of "Shanghai Dreams," Wang Xiaoshuai, has seen his films censored by the authorities in the past, so when the Film Bureau allowed him free rein to shoot the film, he framed the letter and displayed it in his home. Reuters reports.