In 1909, Ahn Jung-geun, a resistance fighter opposing Korea's subjugation by Japan, struggles across the frozen Tumen River. Meanwhile, his fellow resistance fighters question his whereabouts and loyalty. Ahn returns but has his leadership challenged because most of the fighters under him had died in a recent successful attack against the Japanese. Ahn had refused to commit war crimes by executing prisoners of war, including officer Tatsuo Mori, and freed them. Mori tracked down Ahn's group and slaughtered them with cannon.