This study focused on the fact that prior research on organizations focused on loosely coupled systems (LCS) had a narrow analysis target, focused on a flat analysis, and lacked analysis on the LCS operating mechanism. In line with this, the factors driving LCS, operating mechanism, and performance were analyzed multifaceted way through targeting Korean associations and their media pairs. As a result of in-depth analysis focusing on multiple cases, first, heterogeneity of tasks, environmental uncertainty, and institutional pressure were found to be important factors driving LCS. Second, transformational leadership and members' acceptability of change were found to positively moderate the effects of task heterogeneity, environmental uncertainty, and institutional pressure on LCS. Third, LCS was found to positively increase the organization's activity diversity and environmental adaptability. In addition, it was found that the association maintains coherency through mechanisms such as financial support, concurrent positions of executives, shared vision, joint activities, and creation of organizational culture, while granting autonomy to the association's media outlets by loosely coupling. The study is the first to integrate organizational boundaries and LCS perspectives, and has the significance of expanding and deepening the existing research on organizational structure design. In addition, the study has practical contributions in that it increases the possibility of using the LCS model by presenting a distinct mapping of fittness among LCS driving forces, LCS form, and LCS performance targeting the media affliated with the association from scrach. I hope to restore the full richness of LCS in organization studies.