Sewoon Mixed Use Building was the 1st Mixed Use building in Korea and the largest electricity shops and apartment in Asia at that time. In 1970s, it was the symbol of rebirth of Korea from the demolition of Korean War. However, Sewoon Mixed Use Building was a mega structure that was not harmonious with the urban context. Although architects thought shops and elevated streets of Sewoon Mixed Use Building could vitalize the vicinity, it did not work as their ideal plan. As a result, the mega structure has been working as an urban wall that makes nearby districts such a slum area. Moreover, people don’t want to live in the apartment of Sewoon Mixed Use Building so that many housing units have been changed into offices. In this situation, I want to find an architectural solution to revitalize Sewoon Mixed Use Building area by reusing the old mega structures. The Sewoon mixed use building is divided in four buildings. People call them (Sewoon, Daerim, Jinyang, Sinseong) just Sewoon Plaza and the area Sewoon Plaza is located is considered as Sewoon Plaza district. This study focused on two buildings (Sewoon, Daerim). These two buildings are located nearby Jongmyo shrine park and Cheonggye creek park, and they have coonenient public tranfortation condition. Therefore, they have a potential background to be a successful renovated project. The project goal is to make an incubator to change nearby area including Sewoon buildings. The first strategy is making an arcade. Through this long arcade, new Sewoon plaza could become a part of urban context by connecting nearby urban streets and parks. This condition would make people visit Sewoon plaza easier, and new programs of Sewoon plaza would spread out and change slaum areas at the same time. The second strategy is to add new programs. New progrmas are apartment, shop, restaurant, studio for shop, theater, museum and gellery. Residents who can stay even at night are essential element to escape a slum area. Shops that sell artistic craft items and studios for them would make Sewoon arcade attractive. Museum and theater are for young artist, independent movie and small play. In the future, if new programs work well in Sewoon arcade, neighbor buildings would accept these programs and the slum area would disappear continuously. / text