The below is a tentative translation of what @takataka_land tweets in Japanese.
Only thing we see on TV in Japan is news in Hangul (Korean letters), making me sick. A pain in my ass will be gone if two Koreas kill each other until they become extinct.
And, then Japan can get even with her own past mistake in making Korea independent from the Chinese domination and in saving Korea from Russia going southward.
Korea was a vassal state of China for more than one thousand years until Treaty of Shimonoseki known as the Treaty of Maguan in China was signed on April 17, 1895. The treaty set Korea free from Qing Empire of China, thus ending the First Sino-Japanese War. Korean peninsula has never been independent in its history except when Japan signed the treaty with China. However, Korean independence lasted until when it was annexed to Japan on August 22, 1910.
It has been divided into two Koreas since the end of WWII. We all recognize South Korea and North Korea as independent states as both represent at United Nations.
Article 1 of the Shimonoseki treaty states:
China recognizes definitively the full and complete independence and autonomy of Korea, and, in consequence, the payment of tribute and the performance of ceremonies and formalities by Korea to China, that are in derogation of such independence and autonomy, shall wholly cease for the future.
As clearly stated in Article 1 of the treaty Japan concluded with China, Korean peninsula became independent for the first time in its history.
South Korea has been denying the historical fact described above.