This study discusses how advancing the Changjitu Development Plan can facilitate Northeast Asian cooperation and contribute to the peace and unification of the Korean peninsula. It uses the concept of the Korean peninsula economy to emphasize that the unification of the Korean peninsula serves as an open process for Northeast Asian cooperation. There are concerns that economic cooperation between North Korea and China may negatively influence the North Korean nuclear crisis. However, this study maintains that factors such as the response proffered by actors such as South Korea can influence the various methods and opportunities to overcome the problem and that North Korea’s active efforts for regional cooperation in the form of the TRADP will not only bring Northeast Asian economic cooperation to a new level but also facilitate the resolution of the North Korean nuclear crisis. Lastly, attempts are made to introduce a development strategy that revolves around clear relations between Northeast Asian economic cooperation and the Korean peninsula economy.