A group of boys decide to form a guerrilla unit in order to sabotage and spy on the American enemy after one of the communist-controlled cities falls to them.

The film tells about the life and struggle of the Korean peasants living on the Phundekber plain, near the 38th parallel, against the Americans and the Lisinman people. The film is set in 1950.

About how spies made their way to the plant where Geum Sam works and how they, using some facts from his biography, want to force this person to help them in their criminal activities.