I've compiled some great tips for Korean convenience stores (Must-read for Mongolian friends)

Things you'll regret not knowing about Korean convenience stores: 1) There are often buy-one-get-one-free promotions on lunch boxes after 5 PM. 2) Triangle gimbap tastes better when heated up. 3) You can exchange currency at convenience store ATMs (fees apply). 4) Make sure to get coupons from the CU app! 5) GS25's Cafe25 is the cheapest for coffee.