Cluster theory, in relation to securing national competitiveness, refers to productivity improvement via sustainable innovation. Creative ideas, novel knowledge, and technology facilitate the innovation of companies, and innovative intellectuals can play a central role in the changing paradigm of industry. In this context, interactive districts, in which interaction takes place, resulting in the expansion of tacit knowledge, are important in yielding innovative outcomes. The Seoul cultural industry cluster differs from an “industrial district,” which is simply a geographically and functionally integrated area in that it focuses on developing and spreading novel technology and knowledge through networking. Seoul Digital Media City (DMC) is a creator-led cluster currently in an early growth stage and requiring an industrial infrastructure; a soft infrastructure for the cultural contents industry is currently under development. However, some drawbacks exist, including its deficient role as a system integrator, unprofessional aid services, and non-autonomy due to the administration being a central operating body. To invigorate DMC further, it will be essential to seek results through innovation. Participants must actively engage in differentiating among the roles of various agents, engaging in network formation, sharing an open organization culture, spreading knowledge, exchanging human resources, and establishing a stable business system.