Not at all vegetarian friendly, and they sneak meat/fish into random items; I bought a "potato and egg salad sandwich" at the airport. There were bits of fish in it. I ate it anyway. That sandwich is not the reason I was sick when I got home.
I figured that, since I was going to be in Seoul for nine days, I should go to more than one concert; I got tickets for the entire series of three. I purchased two short-sleeved jerseys, two long-sleeved jerseys, two mini cross-body bags, two cell phone lanyards (which I won't use for a cell phone; I'll put my work badge on it in case I ever have to go back to the office), and one pack of temporary tattoos.
I purchased duplicates so that I can have one of each for the collection and still wear/use the useful items.
I had originally booked a goshiwon (small room with a shared kitchen/bathroom) for nine days. They lost my reservation, but had a room available for seven days. The room was small enough that I could reach across the room with my cane and turn off the light. The big advantage of the loss of reservation was that I could spend the
last two days of my trip in a three-star hotel in Gangnam that included breakfast.
Most parts of Seoul have at least one coffee shop per block; some parts of Gangnam actually have three. If you travel to Seoul and forget something, Daiso is your best friend. I made pilgrimages to both the Gangnam Style statue and the P Nation building.