This paper analyzed how the internal pro-Japanese group issue was settled at the time of the founding of the North Korean military and how the process was carried out through the Allied Translator and Interpreter Section(ATIS)’s Prisoner of War report. Academics say that the liquidation of pro-Japanese group in North Korea has been thoroughly carried out even the remnants of individual lifestyles. However;given that no specific legislation has been enacted since the establishment of the North Korean regime on the liquidation of pro-Japanese group;furthermore;the liquidation of pro-Japanese group within the North Korean military is nothing more than propaganda. Moreover;there is a danger that existing studies follow the North’s propaganda logic by quoting documents inside the North as they are. As it has been confirmed that there were many former Japanese soldiers inside the North Korean military;especially those from various Japanese military academies as well as those from special forces;the perception that the North’s liquidation of pro-Japanese group has been carried out thoroughly;as previously known;should be enhanced. In this paper;we tried to find out how former Japanese soldiers were present inside the North Korean military at the time through a report by the ATIS. According to a report compiled by the Far East Command;the existence of some North Korean military officers and soldiers from the former Japanese military is confirmed. According to a statement by a prisoner who worked at the North Korean Air Force Security Command;most of the personnel composition of the North Korean Air Force is from the former Japanese military. In addition;most of the North Korean military conscripts graduated from a Japanese medical school and served in the pre-Japanese military before being conscripted into the North Korean military and serving as officers. Also;some of the North Korean military infantry officers were former Japanese military officers;but they served as operational staff members of the operational officer or the frontline command. After all;the propaganda inside the North Korean military;called “a thorough purge of pro-Japanese group,” can be confirmed to be different from the truth through the North Korean pow’s report.