Everything is good, staffs were helpful able to speak simple English, but they missed out the most important basic information, the store's name and how to go there , not just the address only which Google maps could not navigate...only NAVER map will work. Take note :store name is GAMSUNG GYOBOK Main Branch, not the one beside Lotte World entrance gate (Wild Gate) when you get out of Jamsil subway station in the basement, those are pop up stores without prior reservation. You must go to the store which is located outside, behind the lake (outdoor theme park), about 10 minutes walk. Go to exit 3, walk straight towards the Lotte World Big Logo, find the way until you see on the right hand side the lake, at the intersection turn right you will find the building, they are at 4th Floor. Attached photos to help others navigating to the store, hope it helps.