This does only work on MapleStory Europe. Talk to Mr.Goldstein in Lith Harbour and it will give you EXP untill lvl 170. There will be 2 options, just click the second one and you will get the EXP. Each time you talk to him you will level up once.
This does only works for Evan, Aran, Mercedes, Phantom, Luminous, Kaiser and AB.
NOTE: You have to auto assign your AP a few times to carry on leveling
/To GMS people - this isn't anything new, it happens at EMS a few times per year. It will probably be patched next week.
Credits to ash12345.
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Highly not recommended to use on mains, GMs are camping all channels to ban everyone who use this.