Note the interesting lunchtime culture in Korea, too.
Men eat with men, women eat with women...etc. etc. etc. Women get to dress casual, colorful (maybe even a bit sloppy) in Korean offices these days. Men have to suffer in the heat with obligatory neckties, and boring, white business shirts all looking the same.
That looks like the line outside of Bluebird Liquors in southern California when there's a big lottery pot going...
Must be some good soup! I remember there were plenty of eateries all over the place in Seoul, and lots of curbside concessions too, so it's not like this is the only place in town.