Okay it would be extremely embarrassing for him to argue with Park Yoo-min about this in front of the stranger (as well as the support staff and the news cameras outside the yellow tape) so he will bump fists, sure. 

(They are actually a pretty reasonable amount of compatible.)

(Lee Tae-gun has suddenly understood exactly the purpose of this arcane gesture and might in fact like it.)

"You said the boss monster is a huge centaur? Sounds like that'll be fun!"

Yaaaay new top candidate for sitting next to later! "Yeah, do you want to see a picture?"

"Oh yes absolutely."

That... might be tactically relevant? Sure.

Picture of the centaur! "He'd be taller than a house if he stood up so maybe don't let him do that. I post this kind of thing to my blog, is that okay? After the dungeon's clear, not while the centaur is menacing anybody."

"Yeah! Link me the blog later, I'll subscribe."

"Shall we?"

"We shall! It's time for the less cerebral of us to do the part of the job that involves hitting things very hard until they stop moving," he informs Haru solemnly.

"Oh, did someone publish stats about which powers people get having literally anything to do with their cognition, that'd be exciting news."

"I wouldn't know, I'm not smart enough for stats."

Aaaaare they going to go do their jobs or are they just going to stand around chatting all day...?

Fiiiiine fine. "We'll go in before Tae-gun decides to go on his own but you owe me cat pictures."

"Absolutely!"

And in they go to rescue some people and kill some minotaurs and a centaur!

So now Haru has nothing to do until they come back, except for maybe making friends with all of the support staff and/or the news reporters and/or the onlooking civilians.

He'll talk to reporters! Parasocial's better than nothing and it's often easier to schedule Reading The Comments than it is to schedule real live human beings. He will make sure the folks he tagged with doodads are holding up okay! He will message Yamanaka Junko one (1) emoji which she will be able to decode according to their lookup table to indicate that he is going to show up to the silo to put his feet on her feet within thus and such an expected time frame! He will tell Cricket and his parents that he is unscathed by the dungeon! He will see if the support staff need any stuff they don't have!

Korean reporters are not as used to him as Japanese ones so they're super curious and would love to get some sound bites. Most of them don't even know who he is, really, but they'll take what they can get and espers are usually so reserved, especially Quasar ones, so this is novel.

Is this his first time in Korea? Is he new to Quasar? His Korean is very good for a Japanese person! Oh, he's Canadian? His Korean is even more impressive for a Canadian person! Had he worked with Quasar before? Had he worked with Lee Tae-gun before? What is Lee Tae-gun like? Had he met Quasar's hot new teleporter before? Does Quasar have plans for his teleportation power? Etc etc etc etc.

He's been to Korea once before on vacation with his mom! He's just met all of the lovely folks of Quasar today, but they seem great! Lee Tae-gun didn't talk much but he seems dedicated and goal-oriented, which is what you want in a dungeoneer! The new teleporter is very cool, but Haru doesn't know much about Quasar's plans what with how he mostly operates in Japan and on specialty deployments suited for his powers!

The people being rescued by the other espers start to trickle out, usually escorted by one or another of the four who went in (or, well, not Min Woo-young, who remains inside throughout) and then handed off to support staff—though that might perhaps be a job Haru would want to take?

Sure, especially if they've got tourists who need an English or Japanese speaker!

They absolutely do! Tourists are various levels of bedraggled but most of them seem to be altogether untraumatised by the experience. Some want to take pictures with him, too.

Sure! Selfies for the selfie god!

The rescues eventually stop coming out, and a while after that the portal makes a loud vvvvwommmm noise and its edges turn green.

The other espers step out immediately after that, all looking pretty backlashed. Park Yoo-min looks like he's having a lot of trouble controlling muscle spasms, but the kind of trouble where he's mostly succeeding, and grinning while he's at it.