The dungeon is in Korea, but as an esper with a pretty specialised power niche Haru is used to occasionally having to go international for these dungeons, and the fact that he already speaks Korean is definitely a bonus. The espers he's going to be working with are all in Quasar Guild, which is the largest one in Korea and which has just recently acquired a very powerful teleportation esper, one whose power can be stored in batteries Quasar also happened to already have in its possession, so they're covering the teleportation cost for Haru to get there.
Bell and Jaeha
this_peculiar_power
The restaurant also offers delicious dessert, naturally, and Jaeha continues to feel extremely satisfied by how this date is going. He's especially satisfied by having positively surprised Haru with the nice food, when Haru had mentioned that he wasn't too much into food.
And Jaeha himself is not really that into it, actually; it's delicious, don't get him wrong, but it's not about the food. It's about how it's so romantic and nice and the atmosphere is great and he's only a little bit embarrassed by how much he's enjoying himself and feeling like a successful boyfriend.
The Jaeha of six months ago would be very incredulous about all of this. The Jaeha of now is very smug about that.