Does anyone know the requirements for getting this quest to appear? I did one, but the next one didn't appear even after waiting for a day.

In reply to my question above, the cooldown seems to be exactly 24 hours (not midnight as I thought it would be)

I somehow did the III part and now none of quests appear, even after 2 days. Know how to fix it?

I've got I, II and IV but after that no more quests for me, even after 5 days up until now. I check on him every day.

It seems the quest will shown randomly, so might aswell park ALT there and check time to time.

I was looking for the quest here and it was not showing while I had repeatable quests hidden in the O menu (icons ate the bottom). Enable them and it showed up for me.

From what I found on YT it seems that NPC gives quest randomly. So if you can't see it, it may be that Ahryung selected quest you already has knowledge on, so you can't see it. As it seems every alt may see different quests it may also be that only one of your characters can see it on given day. So two solutions here: either park one alt and patiently check every day, or gather all alts and check on everyone if the quest appears.
I'm lazy so I'm testing first one, will update if I'll get lucky :P

PS. You have to have knowledge from every town's Big Auntie on their Gukbap to start the quests. It costs 200 energy each.

eu consegui pegar todos os dias uma quest, porem teve um dia que fiquei sem pegar e então elas não apareceram mais. verifiquei meus chars e todos estão pra visualizar todas as quests, algupem sabe o que houve?
https://ibb.co/QKcMQtB