Maybe it's Arwen!

Level	18+
Class	Beginner, Super Beginner Dawn Warrior, Dawn Warrior (2nd job), Dawn Warrior (3rd job) Blaze Wizard, Blaze Wizard (2nd job), Blaze Wizard (3rd job) Wind Archer, Wind Archer (2nd job), Wind Archer (3rd job) Night Walker, Night Walker (2nd job), Night Walker (3rd job) Thunder Breaker, Thunder Breaker (2nd job), Thunder Breaker (3rd job)
Area	Cygnus Knights
Start	Hersha
End	Arwen the Fairy
Rewards	4,550 EXP
ID	20716

Maybe it's Arwen! is a Cygnus Knights quest started by Hersha.

Requirements

Offer: You... are aware that there have been a number of unfortunate events related to the puppeteer, right? No one knows how these monsters are being controlled by a central power. Everything around here needs to be scrutinized and suspected. Come to think of it... don't you think Arwen the Fairy is a tad bit suspicious as well?
Arwen seems strange! Otherwise, how else can you explain the fact that she always losing her glass shoes? A fairy who loves forest, and she's standing in Perion! I think she's just doing that to disturb the great people of Maple. Maybe she's being controlled by the Puppeteer! We need to look into this!
In progress: Haven't you gone to see Arwen yet? I thought I told you to find Clear Tree Sap at Top of the Tree That Grew, and give her the medicine.
Completion: What is it? I am not fond of humans... wait, is that Clear Tree Sap? Is that for me? I can't believe there's a human being out there that is sensitive enough to offer me something as great as this. I knew my beauty would work in the human world, as well.