[1] Immediately after the Mukden Incident, he joined the guerrillas in Mishan County, Heilongjiang Province, the predecessor of the 4th Army of the Northeast Anti-Japanese United Army in China and started an anti-Japanese movement.

[citation needed] After coming to the coast in 1939, he completed the Northeast cadre training class at the Anti-Japanese Military Administration University in 1940.

[citation needed] In November 1945, under the direction of the Chinese Communist Party, he moved to the northeast region and worked as a political member of the 1st Zone of the Northeast Korean Volunteer Army, strengthening the army and protecting Koreans in the area of South Manchuria.

[citation needed] In July 1949, as the commander of the 166th Division of the People's Liberation Army, the majority of Koreans entered North Korea, leading the unit.

During the Korean War, he led the 6th Division and crossed the Han River first through the Gimpo Peninsula, occupied the Chungnam and Honam areas, and massacred civilians in the occupied areas through the 6th Division and partisans under his control.