This study explains relationship of low-carbon green growth among China, ROK, and DPRK. How this and inter-Korean cooperation in energy & environment were interrelated will also analyzed here. Low-carbon green growth is indispensable to sustaining industrial and economic development of these three nations. It seems as if green growth was last on the list of concerns of Western politicians. But now China and South Korea as well as some Western countries were keen to tell the world that they have a strong interest in green growth. 'Green growth' and 'sustainability' are the words on the lips of people all over the world. ROK hosted the Group of 20 Summit and the government's strong drive for green growth reshaped Korea's position on the global map. With the help of President Lee Myung-bak and world leaders, the Global Green Growth Institute has recently turned into an official international organization. Furthermore, the president pledged to establish a Global Green Technology Award and raise government financial assistance to promote the green growth era and motivate talented minds. South Korea is willing to help DPRK with green industry, even for future unified Korea.