Nihonjin, NK leader are no idiot. They will not allow anybody out of NK easily. The Kim is smart to hold these people who can travel out of NK ramsom by keeping their loves one in NK. If they act anyway against NK interest when overseas. They will not see their love one like mother , father or sibling anymore. Do you think these young NK school girl in Japan or China who are specially allow to travel overseas can openly display their distaste of Kim leadership easily? Of cos these overseas NKorean are instructed or trained to act in according to interest of leader Kim before allow to go overseas.
Ask how many illegal NKorean who escaped still sing praises of Leader Kim?
Yes, I agree with you, that the Leadership in North Korea is capable, calculating, and almost omniscient in how it is operates the country micromanagerially speaking. I suppose one has to take into consideration the concept of the 'Cult of Personality' being applied in the context of the North Korean State. We have in the country, since the rise of Kim Il Sung , the utilization of cult following and the practical deification of Kim Il Sung , being elevated after death into some kind of god-like being. The same has been seen in the case of the recently deceased Kim Jong Il.
I have had the honor of visiting some Chongryon-funded Korean schools in some wards in Tokyo several years ago and am really surprised to see how alive and strong the 'Chosenjin' identity really is, even here, in the heart of Japan. Tho the Zainichi Chosenjin speak Japanese as eloquently as any other Japanese, have mannerisms as Japanse, even "look" Japanese, the moment they enter a Korean school or a Korean household, their Japanese facade melts away immediately and they revert to their native tongue, and become as passionate as any other Korean who lives in Korea. Its really amazing if you think about it, the level of national devotion, or in this case, ethnic devotion.
Now I should say to you that within the Koreans who live in Japan there are two different groups; those who come from South Korea and those whose ancestors came from what is now North Korea "Heijo" in Japanese. The Korean-Japanese who came from North Korea have a totally different demeanor about them even mannerism and thinking as compared those who originally came from southern part of Korea. The North Korea Japanese are boistrous, very nationalistic, and even tho they have been raised in Japan and many of them have never ever been in North Korea, --- are patriotic about North Korea. Its just amazing, really.
I don't know if you have had personal face to face interaction with North Koreans, but I have, those who live in Japan. Their ability to switch from Japanese identity to 'North Korean' identity with seamless ease is just .... amazing.
Ask how many illegal NKorean who escaped still sing praises of Leader Kim?
I don't discredit this point, this is absolutely true, my friend. However, for the majority of the North Koreans who live in North Korea, they actually believe the words of their leadership with undying devotion. You have to understand that Koreans, especially North Koreans, have that kind of mentality. Of the extreme.
I think you should know this; given the unique trichotomies between the Japanese vs Korean vs Chinese characters.
but saw a lot of Chinese people on diplomat saying it will happen very soon just because South Korea never liked Japan and US will prefer Japan over ROK which means ROK will fall under full control of China and yuhoo Korea reunified as its China best interest 
but seems like they forgot to take the hatred in the heart of Koreans for each other into account 
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