In Luminescent Caves there's a bunch of spider guards defending the Vithrack Common House. They are friendly at the beginning but will turn against you several seconds later after a spider finishes talking to himself about the crystal. So i just force attacked them directly cuz it is a waste of time watching this. But i guess this made the game believe i start attacking friendly NPCs so even those miners in level 1 became hostile. Thus i cant finish the quest 'Whispers in the dark' cuz Foreman Ismey is hostile now.
I don't think i am willing to proceed in this stupid situation. And i cant figure out why there is a connection between Vithrack and miners. If there is no solution about this, it is time to delete the game.