A propaganda film produced as part of the “One National Body” policy put forth by Japan in 1937, which claimed Cho Sun and Japan to be one nation. Jeom-yong finally fulfills his dream of driving a military train. His younger sister, Young-sim, works as ‘gisaeng’ girl for Jeom-yong. His frined, Won-jin is Young-sim’s fiance. In order to acquire the money to save Young-sim, Won-Jin sells information about the train schedule to a spy. Neither Jeom-yong, who suspects his friend of betraying him, nor Won-jin, who feels guilty about selling the information, gets much sleep.