More than one thousand extras from Na's hometown Hoeryong were employed in the filming of Salangeul chajaseo, making the film into a symbolic epic national exodus as a protest against the Japanese occupation of Korea. Originally entitled Crossing the Duman River (두만강을 건너서), the film was banned and censored by the Japanese occupying authorities after its first showing.
More than one thousand extras from Na's hometown Hoeryong participated in the filming of Salangeul chajaseo, turning it into a symbolic representation of Korea's national departure as an act of protest against Japan's occupation. Originally titled Crossing the Duman River (두만강을 건너서), the film was opposed and censored by the Japanese authorities after its first presentation.