North Korea is different from us. Our country is very big. After the implementation of reform and opening up, despite the impact of foreign culture, it can still maintain social stability and harmony and devote itself to economic development. If North Korea is as open as China, it may not be able to withstand the impact of various foreign ideas and information.
In fact, North Korean officials have repeatedly stressed the necessity of reform, but the purpose of North Korea's reform is to deal with internal crises and reduce the government's burden. Most of the reforms in North Korea are aimed at the distribution system. North Korea has carried out several reforms, such as abolishing food ration system, reducing civil servants and currency reform.
North Korea has actually been changing, but this change is slow, not sudden. North Korea followed China's example in establishing special economic zones, allowing black market transactions, allowing foreigners to invest in North Korea, and even setting up international casinos.