It turned out that this valley was indeed the place where the demon organization imprisoned their family members in order to restrain their spiritual masters.
There were more than 2,000 households living in this valley, and they were all held here as hostages by the demon organization. Usually, these people do some work such as raising livestock and cultivating fruit trees in the valley. There was no place for agriculture in the valley.
Even so, most of the farmed livestock will be eaten by the warcraft in charge of guarding here in the end, and the common people can only eat some fruits or some coarse grains purchased from outside.
The valley was surrounded by cliffs on all sides. If you can't fly, you can't escape at all. Even if you can fly, there were hordes of flying monsters guarding the valley above, and you can't escape even if you spread your wings! The only entrance and exit of the whole valley was the crevice through which Wang Wei and the others walked in.
Creation is hard, cheer me up!
Your gift is the motivation for my creation. Give me more motivation!