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.
Bell and Jaeha
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This is why fistbumps instead of handshakes! Flinching from a handshake is incredibly rude and flinching from a fistbump is built into the gesture from the beginning! "And this is Kang Jaeha."
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"Well, Jaeha's at least not too much of a stickler for formality to tolerate me and my Canadian ways."
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That seems to be between them and him as long as Haru doesn't have to remember any honorifics or refer to people as though they are his siblings but in a sexy way. What's on the menu for a teetotaler?