Corridor introduction: There is a front corridor on the first to third floors of the building inward. The pillars of the corridor on the first floor are made of wood and stone. The second and third floors are wooden pillars. There is an altar in the front hall of the third floor. The third floor has a rear corridor in addition to the front corridor. There are no windows on the first and second floors, but windows are opened on the third floor, and there are gun holes.