at lvl 18 sin i talk to the girl and she saise find 12th apprentice,what those that mean and what those it do? im affriad to click on it XD

i clicked on it and its a quest and i got this letter i cant find the guy who i have to talk to in klang valley where is he and what part of klang valley i went to klang valley1-7 and couldnt him

its a quest where u have to find dong gwa
he is located at the portal near mage job npc at klang valley 3