Seoul Mart is small and cramped. But I'm amazed at the people who say the staff/owners are unfriendly. I am not Asian and I don't speak Korean past hello and thank you (and a few other short phrases, the answers to which I cannot understand). However, I find that everyone there has been very welcoming of my family (including our adopted Korean son... and also when we are there without any Koreans at all). They are very friendly, especially if you do try out a Korean hello or thank you. I think people who are saying they are standoffish do not understand that these folks do not speak English comfortably. They can do what they need to do, but English takes a bit of effort and focus and some days are just not good English days.
Great Asian cooking ingredients and snacks that remind us of our time in Korea. Sometimes things we want are out of stock or may be a little stale from how far it had to travel to us, but usually everything is perfect. Kimchi is authentic and I think made on site, but it helps if you can read a little Korean to find the good stuff. Same for bulgogi meat.
And my sons' youth group from the nearby Anglican church traipses all over the store buying things they can't identify for youth-groupy Asian food dares (or whatever they do with it) and always have a good time. Any storekeepers that put up with a gaggle of teenagers dropping in unannounced and not speaking their primary language... seriously these folks are great!