I started using this guide:
https://www.naeu.playblackdesert.com/en-US/Forum/ForumTopic/Detail?_topicNo=43160
to find the required NPCs because i was having trouble locating them.
Only one NPC not far from the entrance to Asparkan has a blue arrow above his head. I went to other NPCs in the guide but they either have no blue arrow, cannot be interacted with or are not present on the map.
I have completed all main quests except Seoul, and i was told by person in Black Desert discord that Ulukita and Seoul questlines are not connected so its unnecessary for me to have to do Seoul questline first.
I had a look at a video guide for the quest and it shows numerous NPCs with blue arrows over their heads. 
https://www.youtube.com/watch?v=pdRgQDAoejE
The blue arrows are missing from my game for all but 1 NPC near the entrance to Asparkan.
https://imgur.com/a/gBl1Vpn 
I don't know how to fix this or get around it so i can complete the Ulukita questline.