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.
"Beyond that, we could get a rotation of people checking in, asking you how you're doing, just generally keeping track of you."
"Do you know of anyone else in Quasar you're compatible with, who could tell how backlashed you are?"
"He's... very reserved and private," Park Yoo-min hedges. "It's difficult to get close to him. Although, for something like this..."
"We're compatible enough I could feel him guiding me from a distance, yesterday. —I think it was asymmetrical, he didn't seem to react at all."
"Oh. Wow." Yoo-min and Seungjoo are compatible enough they don't need to be touching to guide each other but Jaeha and Tae-gun were substantially farther apart than just "not touching". "—did you use your powers on him yesterday?"
"I see. Well, that's a possibility, if he can tell how backlashed you are. And maybe we should find other people, but—don't feel forced."
"Well, you know, it's not thrilling but at least I am so cool that I could redeem him without having even known what I was redeeming him from, or something, so that's validating."
"It was also your thoughtfulness, thoroughness, self-awareness, and ability to inspire me to become a better person."