Driving is fast and attention is needed at all times. As a result, Koreans can't get their driver's license until they turn 20. Twenty is also the legal drinking age. Because many teens are simply too busy with school, underage drinking is not as big an issue. Sex education is now in most junior high and high schools, but parents have a difficult time explaining the birds and the bees to teens.
Korean teens enjoy fast food.
American fast food outlets, along with some Korean franchises, thrive on teens going with friends after school and on weekends. These spicy and healthy entrees make Western food seem bland. Fashion and appearance are extremely important in Korea, especially among the young. Teen girls are generally petite, occasionally sporting a waif-like image. Anyone slightly overweight or obese will feel like an outsider.