@Actnaturally so sorry for radio silence - I hope I'm not too late. I'm away with work and my schedule has been packed. I caught up with DS yesterday.
Food in Seoul - instead of trying to recommend eateries in all of your likely/possible locations, DS and I decided it would be easier for you if I shared the words you need for restaurants/dinner. As you may know, instead of the way UK does food ie one establishment will sell fish and chip, a curry, a thai dish, AND a pizza and desserts etc, in Korea a restaurant is a specialist in one food. So, for dinner our recommendation is you put the following seaches into Google Maps when you are out and about and find a restaurant near to whereever you are and pick one with good reviews. The English version should be sufficient. I think you are there for 3 nights so recommend BBQ pork one night, chicken another and pancakes and makgeoli on the other.
You MUST (😂) try - samgyeopsal 삼겹살 - pork belly (its our absolute favourite)
but also chicken either Dalkgalbi ë‹ê°ˆë¹„ - stir fried chicken (with cabbage and yummy)
or chicken 치킨 - korean friend chicken - it looks a bit like chicken nuggets but is far superior and actually delish, we go boneless)
The google reviews should have photos of outside to help you find each place, and remember it could be upstairs. People are generally helpful.
At risk of telling the whole world, I am going to recommend a pancake place in Gangnam - we think it's good fun, particularly if you are game for the upstairs cubicles as they pass the food up through the window, but it is Korean seating (on the floor) up there. We always have at least one kimchi pancake and have random others. We love having the magkeoli (mack-o-li) here as it comes in a battered old kettle and is served out of 'dog bowls'.
A street view
9 Bongeunsa-ro 1-gil, Gangnam District, Seoul,
Link I hope
Makgeoli - is a weird flavour but once we got over the intial shock we love it now. Its about the same strength as beer.
I think I've mentioned Ediya coffee for a good decaff selection. We often grab breakfast in one or get something weird and wonderful for 'research' from a corner shop.
We find a difference between Japan and Korea is that in Korea food is absolutely EVERYWHERE so you will not go hungry for lunches. Pop in to Gwangjang Market when you are over that way, it is touristy but sitting down on the benches with some locals is fun, look out for the filled 'fish' (pastries) and other random offering on roadside stalls, and hoettock too (but we don't see many of those the lady here generally has a queue and lots of locals seem to take away a bagful. I think you may be staying in the area). We eat whatever we fancy and have had no ill effects hygiene wise (although I am wary of excess spiciness).
There are lots of offerings on Instagram like Cafe Onion as, like the Japanese, the Koreans like aesthetics and 'cute'.
If you aren't on your way already please let me know of any final queries, I'm sorry ive left it so late.