The issue of the border between North Korea and China.

 This is one of the common repertoires that comes out when talking about kando. "In 1712, the border was established as a monument to the political system of Mt. Baekdu. Tomun here is not the Dumangangang River, but the Tomungang River, the lower reaches of the Songhwagang River. In addition, the 1905 Japan-Korea Treaty of 1905 was invalid, so the 1909 China-Japan Gando Convention was invalid. Therefore, the border with China was confirmed as Baekdusan Mountain Political Expense in 1712, and eventually, Gando is our territory." But I don't think this discussion is of much significance anymore. As someone pointed out in the past, it is because of the Joseon-China Byeongye Protocol signed in 1964 between North Korea and China. Even if the border is set as the Tomungang River as the Baekdu Mountain Political Monument, it means that the rhyme of the Baekdu Mountain Political Monument is meaningless because it has a new border. In fact, the protocol does not define the border between North Korea and China as the Tumen River, not the Tumen River. Since 1956, treaties have already been signed on the premise that the border is the Tumen River. In other words, it means that the border with China is Tumen River again. The question of "Is North Korea a country that can sign such a border treaty?" is of no practical benefit to discuss. North Korea has all the requirements that the state must have under international law. "Should South and North Korea succeed to this border treaty even if they are unified?""The question remains, but under international customary law, the border thus completed shall be succeeded. It means that the borders created by this treaty must be accepted without having to succeed to the treaty on which it was created. For your information, the Vienna Convention on State Succession in the Treaty stipulates that "even if there is a state succession, the borders created by the treaty are not affected." Of course, the obligation to succeed the border is just common law, and the two Koreas do not join the agreement mentioned above. Therefore, it is possible to reject the succession of the North Korea-China border treaty after reunification. Then I'll go to the International Court of Justice. However, the Kando region has been effectively controlled by China since 1909. Even if the Korean War is excluded, it has been under effective control for more than 50 years since 1953. During this period, the Korean government has never protested against China. Even if you go to trial, you will lose. Personally, I don't think the story of Korea's Kando territorial rights is anything but a historical nostalgia. But what I'm still curious about is whether the soil really means the Tomun River in the Baekdu Mountain Political Monument. According to the records at the time, the Joseon Dynasty thought of the border with China as the Tumen River.