When you visit Korea and want to buy some brand-name products those are cheaper than your country. You can visit some discount outlet not far from Seoul.
Most of the stores are very busy on weekend I recommend visit there during weekday. Visit below website for your happy shopping.
1. Yeoju Premium Outlets
2. Paju Premium Outlets
3. Paju Lotte Outlets
4. Kimpo Airport Outlets
Except Kimpo Airport Outlets you have to bring your own car or rent a car to get there. Or you can ask your Korean friend to bring you there. It takes 1 ~ 2 hours from Seoul.