As 'small city trips' - where you can enjoy the romance of travel without the hustle and bustle of the city - emerge as a new travel trend, what if a K-pop star, who has never had the chance to explore Korea's small cities, takes a 3-day, 2-night trip to them with a foreign friend of the same age? Will you join the travel reality show <Backpack Friends>, where you can discover the romance and charm of Korea's small cities as the girls' friendship grows?