Mysterious Jungle (TERA: The Next)

In the Labyrinth of Azarel mission, you need to go through the teleport to the Mysterious Jungs and kill the ghouls. I did as instructed. Then there was a task to kill Brook. I thought he was outside and went out, but there was no one there. Returning, I accidentally reset the task and now I can not go through it again, because hums do not appear. Tell me what to do?