North Korea’s collapse has been incessantly predicted since early 1990s after communist block destroyed but its practical termination has been suspended over two decades. On the reverse, North Korea would initiative more complicated power struggles in Northeast Asia by getting troubles with nuclear weapons. Nevertheless, just as an urgent status in case of North Korea’s collapse, fundamental aspects of power game between major powers have not much researched in depth and width, where their national interests seriously get involved in. This book digging up the core agenda that the U.S. and China’s competition to predominate the Korean Peninsula will work out as a primary factor of power struggle to impact the Unified Korea when the time of North Korea’s collapse comes up. In the meanwhile, Russia and Japan will also jump in such a dashing political whirlpool while stimulating regional powers. Nonetheless, Korea and the U.S. alliance will finally beat up all the power struggles by conducting successful unification process toward the Unified Korea.