This quest does exist on live, but is very hard to get.
It requires level 90, but at level 85-87 everyone gonna pass through Halfhill and very likely has contacted with someone of the Tillers. Apparently if one has completed the next step A Helping Hand one is unable to get this quest. In addition, it's likely (needs to be confirmed here) that either So You Want to Be a Chef... or "discover Yoon's farm" or both are semi-exclusive to this quest
-- the "semi-exclusive" means that if you have done you wont be able to get this quest (no yellow ! ), but if you have accepted this quest (in your Quest Log list) before you have done, they wont affect each other and can be done in any order.
While this assumption needs to be verified, I can confirm that if you carefully keep yourself away from anyone of the Tillers, particularly those in the market, until ding 90, you will be able to see this quest downstairs of the Shrine. You can discover Halfhill and use its flight path though.