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.
"What's the point of being filthy rich if I can't even teleport to Japan with my boyfriend to meet his family?"
"I hope Woo-young enjoys the fruits of being the backbone of the transportation infrastructure of the Korean elite."
"I'm sure he's not the backbone of it, we had teleportation before Min Woo-young showed up. ...it did become a lot cheaper, though."
"Teleportation's less available in Japan and even more dramatically in North America for casual use, though maybe what I'm seeing here is actually just a difference in what price tag causes you to act less than casually and, across the ocean, what distances tend to be involved."
"North America is really, really big, and really a lot less dense... But I don't really go there unless there's a dungeon to clear, so I don't really know what it's like. If there's a dungeon that needs me specifically in North America Juno always used to cover the cost."
"Yeah, you're much more prone to being needed specifically than I am. Nobody ever needs to pay to haul me to Vancouver, so they don't."
"Seems like the world is under some misapprehensions about how amazing you are."
"My all-around personal amazingness doesn't make my powers more essential for any dungeons! Anyway, where are we going for dinner?"
"...Mingles? Is that in English? That would be a hokey name for a singles bar and it's just kind of weird for a restaurant."
"They are supposedly 'mingling contrasting elements into harmony' but I can't tell you whether that's the origin of the name or whether they just liked the sound of the word and came up with that later."
"I guess mingling contrasting elements is a sound cooking philosophy. Mingle or Mingling would probably have been a better conjugation if they had to, though. I guess it has no bearing on their culinary skill."
"I've been, a couple of times, before I was an esper, when Father wanted to impress someone with both his taste and how much of a family man he was. One time the person we met with had brought their daughter, too, and I have a suspicion or two about that particular encounter, but I was thirteen at the time."
"Did you have lines to recite or was showing up at a restaurant on command sufficient to demonstrate the concept?"
"Those times were before my, ah, rebellious phase, and I was actively trying to be Father's perfect heir, so he didn't really have to give me lines."
"I don't really remember the food itself, so much as I remember thinking at the time that it was very good, so I'll be rediscovering the flavours with you." Also it has three Michelin stars.
"Is it one where I need to know which fork to use and stuff - if so I'm going to need to copy you, the fanciest restaurant I've been to is the sushi spot Ren likes on her birthday."
"It's Korean food, it'll be either chopsticks or our hands." Which obviously means that Jaeha will at some point have to handfeed Haru. It's the rules.
"I had the worst time learning to use chopsticks when I was eight. I had dyspraxia, did I ever tell you that? Klutziest kid you ever saw, constantly falling down the stairs, chopsticks were very intimidating."
"You didn't! That sounds adorable. I'm sure it wasn't great, but it sounds adorable."