Show NPC for certain players only

[NotKappa]

For example in the illusion vampire there is a section where you follow Marina to find 2 other NPCS, the Marina is hidden for all other players but only visible to the player who has the quest.

How can this be done?

I've tried to use classchange with bc_self, but this wont work for distant NPCs from the player when I tried it.

[NotKappa]

I've made a workaround for this.

I used OnTouch: and classchange when the player touch the npc.
 

OnTouch:
	if(illusion_vampire_temp == 5){
		classchange 110,"Priest#illuvamp",bc_self;
	}
end;

But it would be really great if something official from rathena could be implemented so this can be done by using quest id rather than having to use workarounds.

[anacondaq]

https://annieruru.blogspot.com/2019/01/classchange-npc-shown-only-to-certain.html

[crazyarashi]

I believe in the official server they have a way to disable npc for a single id atleast that's what i notice when i copied it. the only work around for this is using OnTouch.