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.
Unfortunately the movie In invisible city is not yet available on Disney Plus.
| Directing | Lee Chae-min | Director |
| Editing | Lee Chae-min | Editor |
| Camera | Lee Chae-min | Director of Photography |
| Production | Lee Chae-min | Producer |