Korean Sun-hee and her brother, Tae-yul, must study Japanese language and culture in school. The symbols of their beloved Korea - like its flag and the rose of Sharon tree - can never be displayed or mentioned in public. When the emperor of Japan decrees that all Koreans must take Japanese names, Sun-hee and Tae-yul become Keoko and Nobuo. But as World War II explodes all around them, Sun-hee and Tae-yul wage their own war to stay true to their family, their country, and themselves.