During a diving drill, the North Korean army finds an UN patrol ship that was sunk in the Korean War and manages to salvage a document from a waterproof iron box that tells the story of several North Korean soldiers and the female army war correspondent who accompanied them on their fatal mission.
Two teenagers were instructed to urgently deliver the enemy's action plan to the partisan detachment. Despite the various obstacles encountered on their way, the guys managed to deceive the Japanese sentries and complete the task.
