This article examines what orthography should be like in the era of inter-Korean language integration, focusing on the initial law. For this purpose, first of all, I analyzed Kim Soo-kyung's 1947 paper published in the 『Rodong Newspaper』 , which not only triggered a change in orthography related to the initial law but also provided a theoretical basis for such change in North Korea. This will show what logic and grounds prompted them to first modify this part of the <Unification of Korean Orthography>(1933). In Chapter 3, I looked into why Joseoneo-hagheo (Korean Language Society) made such a rule through discussions on the orthography of the time. Finally, in chapter 4, I suggested in a experimetal form how to integrate the difference in orthography represented by the initial law in the era of inter-Korean integration. Being mindful that the morphism underlying <Unification of Korean Orthography>(1933) presupposed a homogeneous monolingual society, I looked for the direction of norms to be pursued amid the coexistence of disparate groups that differ in system and culture.