Lilin doesn't give you Aran Ring

If you're wearing your lvl 30 ring when you go to Lilin to get the 50 ring, the quest will go through but you'll get an error popup saying that you can't get it because you're already wearing Lilin's ring. Forfeiting the quest and trying again makes the Maple Admin lightbulb pop up again but when you go to Lilin, she doesn't try to give it to you again; she just says everything will be ok now that the hero is back (or something along those lines, anyway)

You wind up with no lvl 50 ring and no way to get one short of remaking your character, as well as an uncompletable Event quest.