Jeamni massacre
1919 CE.
Shown on the map at 37.126°, 126.894°.
The Jeamni Massacre (Korean: 제암리 학살 사건; lit. 'Jeamni Massacre Incident') was a mass murder of 20 to 30 unarmed Korean civilians by the Imperial Japanese Army on April 15, 1919, in Jeamni, Suwon, Japanese Korea.
Text from the Wikipedia article Jeamni massacre, licensed CC BY-SA 4.0.