Busan is one of the most densely populated urban areas in South Korea. The tremendous pressure this megacity exacts on architecture in terms of urban revitalization promotes innovation. The purpose of this article is to explore the urban renewal in one particular aspect: the outdoor market in Busan. The development of South Korea, supported by a robust policy and reinforced by Chaebols, has resulted in a legacy of unattractive concrete. When the time has come to review, the Korean government has implemented a new and more influential policy with the aim of improving the economic vitality and preserving the Korean culture. Policymakers have not failed this time to follow the train of modernity and opted for sustainable architecture. Busan is a great city and it represents a laboratory ideally suited to this new policy. The strict criteria of sustainable design are fully respected in order to preserve the cultural heritage of Busan community. Two international examples, Mexico and Rouen, served as an inspiration for projects of Busan where outdoor markets represent nuclei of economic productivity and catalysts of social life. Market Jagalchi was in dire need of new ideas and a revitalization project was undertaken that we will study in detail.