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."
"Hmmm..."
Ping. Lock on. An alluring scent, whatever that means for that bug. Something it wants to follow...
"Haven't got a net yet, but if you're good to hold it I can take this guy out of the dungeon and go grab one?"
—wait. That wasn't his power. That was reading body language. He is still doing so well.
Okay. Good. That would have been mortifying.
He comes back with a net that can screw onto a jar like a lid, nabs the firefly, screws it on, and rolls it out of the exit. "Let's go get another person."
It is COMPLETELY EXCUSABLE to kiss in a dungeon. For guiding. They'll be able to keep going longer if he kisses him. Then: onward.
Oh he must never forget. He must never, ever forget. This is what he's doing it all for. To be a person who deserves Haru. Jaeha will go to the ends of the Earth for this man.
The bugs continue to behave merely-cosmetically, and the dryads continue being as aggressive and as unable to pose a threat to them as they've been. The other psychic espers have more trouble with the necessary delicate touch to avoid hurting the victims, but to them this is, relatively, a walk in the park.
Jaeha doesn't forget or slip up even once. He starts feeling cold inside, feeling less, and Haru's talkativeness is difficult to engage with, without being able to use his powers at all so that he can say the things he wants to say the way he wants to say them. This is most keenly felt around the other esper, who is not very close to Jaeha and therefore whom Jaeha feels less comfortable being—broken—in front of. But he would feel even worse if he slipped up, especially in front of Haru. So he doesn't.
And eventually they've got the last victim. They're not especially specialized for finding the core and maybe should hang out and make out guide, responsibly, outside the dungeon, waiting around in case they need Jaeha to destroy the core, but they probably won't and as soon as somebody's killed the dungeon they can go home.
Make out? Outside the dungeon? In public? ...is Quasar okay with that????
Not that Jaeha cares. Not when ✨Haru✨ wants it. Fuck Quasar if they object and fuck the media taking pictures of them.