보이지 않는 도시에서

The invisible 'I' searches for postcards and letters, and eventually takes a train to the industrial city of Ulsan. ‘I’ wanders around the Gongeoptap (Ulsan Industrial Center Monument) area and the Bangudae Petroglyphs (Prehistoric rock carvings in Ulsan), then writes a letter to someone from a place with a view of the factories.