This chapter serves as a bridge between the historical narratives of startup ecosystem development in Japan, South Korea, and China found in the previous three chapters and the subsequent thematic analyses of their innovation landscapes presented in subsequent chapters. Drawing upon the foundational insights established previously, we undertake a comparative synthesis, identifying both the shared historical catalysts and the unique evolutionary trajectories that have shaped distinctive startup ecosystems in these three East Asian economies. While all three nations have demonstrated remarkable economic resilience and a growing commitment to fostering innovation, their approaches towards entrepreneurship have been profoundly influenced by differing developmental trajectories, cultural contexts, government interventions, and strategic responses to domestic and global economic transformations. This comparative perspective reveals how Japan’s technology-centric, South Korea’s supply-centric, and China’s market-centric ecosystems, though distinct, confront common challenges and offer unique lessons. By highlighting key commonalities and persistent divergences, this chapter sets the stage for a deeper exploration of three critical thematic dimensions to startup ecosystem development in East Asia, including cultural influences, government policy, and the forces of internationalisation, which are the foci of the next major part of this book.