What does the second mountain man mean?

Second Mountain Man: A hermit, a scholar, a Shan Ye native, or a fortune teller who ranked second (then or locally).

Mountain people: generally refers to hermits; Also refers to Shan Ye people, modest; In the old society, people who took divination and fortune telling as their profession were sometimes called "mountain people". Most of them appear in ancient poems and in the names of literati.