Introduction to the cottage ruins: It is located on the west hillside far away from the mouth of the ditch. There is a very narrow path leading to it. The village is halfway up the mountain, with a straight cliff to the east and a towering stone pillar-shaped mountain to the west. There are only two exits, the north and the south. The exit is surrounded by mountains and flat land, only three meters wide. It is easy to defend but difficult to attack. One man can guard the gate, and ten thousand men cannot open it. The cottage is the size of a basketball court and contains more than a dozen stone houses.