I feel like there is huge plot hole.
The fact they were going to kill them was pretty obvious from the start with all their silly expressions, not to mention he got 2million won contract for carrying bags, and they are were way too happy for thinking that they all might earn 1mln each for the crystals. Seems like even 2k dollars for them is a lot.
What i don't get is, excuse that they didn't actually kill them personally, they are C rank hunters and those are 2 E rank hunters, it would take seconds to kill, and with sneak attack how easy it is?
Excuse that it might woke up a boss is laughable.
What if.. Just a small if, does not take a genius, does not take a moron to think of, WHAT IF they all go back??
It's that simple, they all go back, they all will agree with this reason. And then.. they will kill them on their way back.
Boss will not be woken up at all. And they get a rich guy gear.
As for other stuff, they certainly have some kind of system to search for a party, what about a team that every time goes with 10 people and comes out with 8? I dunno if they have to have 10 people to enter or it's just guilds rules.