High school freshman Miso is enthralled when she sees her classmate Hyojeong playing a retro handheld video game on the train. Hyojeong’s always seemed kind of intimidating, but the way her eyes sparkle as she plays makes Miso want to learn more about retro games, and muster up the courage to befriend her. When Miso and her older brother Minjun head to the old video game store in their town, not only do they find that it's run by Hyojeong and her older sister, they also discover a nostalgic portal to the past…