Manchuria and modern state formation of Korea

An interesting article, although it's not logically robust enough

In the Korean newspapers in the 1930s, Manchuria was presented as an exit from a crowded Korea, which further induced immigration. [20] Some Koreans became low ranking policemen (Jones 1949: 69). Many who later would become leaders in many fields of South Korea, spent their youth in Manchukuo. Even some respected nationalist intellectuals chose Manchukuo for their new (collaborating) lives. For instance, Choe Nam Sun, the famous poet who wrote the Declaration of Independence for the 1919 March First Independence Movement, taught at Jianguo University (Allen 1990: 788). Three ex-presidents of South Korea experienced Manchukuo. Park Chung Hee was an officer in the Manchukuo Army and Choe Kyu Ha had a temporary position in the Manchukuo government. The extremely impoverished Chun Doo Hwan family also crossed the border for a better life. Kim Il Sung, the North Korean leader, was a cadre of the Northeast Anti-Japanese United Army, while Park served on the opposite side in Manchukuo (Suh 1988: 20). Indeed, Manchukuo incubated the leadership of both Koreas.