THE MOUNTAIN was killing them.
Geun saved the Mountain Spirit, his mother, from the shaman that she fought earlier.
However, leaving the mountain proved to be difficult.
Entities that had a grudge against the Mountain Spirit took this opportunity to attack them. Since the Mountain Spirit lost to a shaman, his mother, unfortunately, lost the respect of the beings it used to command.
And now, they had become the target of the ghosts and entities in the mountain.
[They probably want to either eat the Mountain Spirit to gain more power, or kill her to take her place as the mountain's leader.]
Geun could have left the Mountain Spirit and saved himself.
However, the weird sense of filial duty he had stopped him from abandoning his "mother."
[I have to fight.]
Geun left the Mountain Spirit next to the waterfalls. It was the area where his power had most influence in. Hence, he hid his mother there.
***
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