2003.Aug. 30, the Cheonggyecheon Expressway, the five-kilometer overpass in very downtown Seoul has been completely demolished. This amazing event is for the Seoul metropolitan government's Cheonggyecheon (Stream) restoration project. This project is intended to turn the capital into a city friendly to both the environment and people, and make Seoul the financial and commercial hub in the East Asian region. This is a report thinking that this project is truly sustainable or not.