During his revolutionary activities at Hwasong Uisuk School in the mid-1920s, the President made his effort to find a new way for liberating Korea from Japan's colonial rule. He explored the genuine path of the Korean revolution, the road of independent development, provided the hard core for it and pushed ahead with the work to form a vanguard organization of the revolution.

He told the young core members sharing the intention with him: We must open up a long and thorny path in order to liberate the country and build a society in which the working people can live happily; if we build up our ranks and fight tenaciously at the cost of our blood, we shall emerge victorious; after forming an organization we should rally the masses behind it and arouse them to liberate the country by relying on their own efforts.

Later, he discussed the name of the organization and its character, fighting programme and norms of activities with them.

Under such detailed preparations, the President formed the DIU, a vanguard organization of the revolution, with young communists of the new generation on October 17, Juche 15 (1926). At that time, the President was in his teens.

The aim of the DIU was to defeat Japanese imperialism occupying Korea militarily and achieve the liberation and independence of Korea and, further, build socialism in Korea.

The formation of the DIU was a historic declaration heralding the new start of the Korean revolution. Since then, the Korean revolution has advanced along the road of independent development with definite fighting target and strategy.