The possibility of regional cooperation in the Yellow Sea Rim (YSR) area has been discussed since the early 1980s. In recent years, Korean outbound foreign direct investment (FDI) has increased rapidly and it will be growing much further. In the new phase of the global economy and the post-cold war political environment, Korean firms consider the socialist countries, especially China, to be attractive new partners for trade and investment projects. Foreign investment contributed to economic growth in developing countries. In the early stage of industrialization in the 1970s, the share of foreign firms amounted to about one-tenth of the total manufacturing employment in Korea. Similarly, outbound Korean FDI could also play an important role in the industrialization of the LDCs in Southeast Asia and China. A case study of a Korean multinational corporation reveals that the direct employment effect of Korea’s FDI is extensive in terms of money invested. In spite of the complementarity in economic structure and the phase of development between Korea and China, the prospect of Korea’s outbound FDI is not all clear. However, one can safely assume that the unit scale of FDI projects will increase. Unlike in the past, the large Korean corporations are now preparing more than a few fair-sized projects in China. The positive impact of those FDI will be significant. The YSR cooperation, if successful, could create efficient economic cooperation based on complementarity between Korea and China. The Korean outbound FDI would pave a road to such regional cooperation.