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Known for his strict discipline and cold demeanor, Sergeant Kyeongnam has his bicycle stolen while on leave. In pursuit of the suspected thief, he encounters three Cub Scouts—Gah-eul, Yena, and Dasom. When he learns that the culprit is connected to the Scout troop, Kyeongnam reluctantly teams up with the three children to recover his bicycle, embarking on an unexpected adventure along the way.