 After gaining the latter's trust by having himself intentionally arrested several times in the process, he was able to gather intelligence allowing the Japanese military to neutralize a spy network of about 60 agents from the Soviet Union.After the Surrender of Japan and independence of Korea in 1945, Kim came back to his hometown, Hamhung, finding it to be under Soviet occupation.Wanted by the Communists for being a former Japanese soldier, he had to keep a low profile.