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.
The victims of this one are not very talkative, by the time they start ferrying people back, Haru's talking to Jaeha. "It's weird for the bugs to be cosmetic, I kind of expect them to swoop down and try to murder us at some provocation, maybe bringing people out."
...okay, he still remembers a little bit of the reason why he's doing this, and it's because of his adorable gorgeous perfect BOYFRIEND.
He can't mention his receptive powers, though. Not in front of the other esper. "I suppose we'll have to keep an eye out. I'm ready to distract them if need be."
"I'd kind of like to catch one of the fireflies. Though maybe if it shrank like Cricket it'd just be a normal firefly and then it would be less interesting."
"Hmm. If it has enough of a mind to illusion it might be possible for me to lead it after us..."
"We'd need something to keep it in, like a net or a jar or whatever, even if you coaxed it there that way."
"Yeah, maybe, I guess they don't know the bugs aren't valuable so they'd have stuff just in case. My money'd be on the kind of mossy stuff on the branches, though, wouldn't surprise me if that wants to be the next industrial lubricant or something the way it slips."