hi there, I don't know much about maplestory but a quick google search mentions some threads where multiboxingisn't allowed in MapleStory:

https://forums.maplestory.nexon.net/...s-at-same-time
https://forums.maplestory.nexon.net/...ll-not-allowed
https://forums.maplestory.nexon.net/...s-now-no-hacks
https://old.reddit.com/r/Maplestory/...on_maplestory/

It also looks like booting up a 2nd, 3rd, etc. client of MapleStory isn't possible without third party VM software too?