Linshui Town of Mountain God

There has been no demon disaster in Linshui for hundreds of years. I heard from the old people that it is because the big demons on the mountains control the smaller demons. As long as the people of Linshui pay tribute to cattle and sheep, peace can be guaranteed. In the disaster year, the grain harvest was poor, and Qing Su, who was wandering on the streets without food, could only risk going up the mountain, but why was the big monster on the mountain different from what the old people said. What is the truth behind the demon trouble in Linshui, and is this so-called mountain god a human being?