1980年的光州事件，是南韓民主運動史上最慘烈的抗爭；但2015年，前軍方官員卻指控現場影像中的某人，實際上是北韓派來煽動的間諜。一時引發軒然大波，憤怒的受害者們甚至打算提出告訴，然而照片裡這位「金君」究竟是誰，卻無人可以作證。導演追訪當時參與民眾，宛如偵探般抽絲剝繭，逐步逼近金君真實身份同時，也為光州事件記憶的空白處，填補進最溫熱的血肉。

KIM-GUN searches for the whereabouts of a young man whose identity has sparked a national controversy over the 1980 May 18 Gwangju Uprising. Starting with the vague memories of those who had crossed paths with him during that time, the film tracks down those who participated in the Uprising as “Citizen Soldiers.” It also traces KIM’s final steps, based on photographic clues found in the firearms he carried and the “Surveillance Truck No. 10” in which he rode. By identifying KIM-GUN, we believe that we can find valuable leads to resolving the ongoing controversy over May 18. Why did a nameless young man join the Uprising? Why did he take up arms? Where has he gone afterwards? It is the answers to these questions that the film seeks.

1980년 5월, 광주 도심 곳곳에서 포착된 한 남자. 군용 트럭 위 군모를 쓰고 무기를 든 매서운 눈매. 군사평론가 지만원은 그를 북한특수군 ‘제1광수’로 명명하고, 누군가는 그를 한동네에 살았던 ‘김군’이라고 기억해내는데…