在城市的地下，隐藏着不为人知的秘密与故事。考虫的课怎么永久下载

　　A documentary about the underground structures scattered around East Asia and their history. Starting from Busan, the film explores Jeju, Okinawa and many other places of painful history in East Asia. As the recent images are overlaid by past voices, unforgettable historical memories are recalled. The lasting underground structures remain as a scar of history.