South Korea's government used 300 drones in an unusual display to thank frontline workers and to encourage citizens to keep battling against the spread of coronavirus.
원문출처 : https://www.cnn.com/2020/07/08/asia/south-korea-drones-trnd/index.html
원문출처 : https://www.cnn.com/2020/07/08/asia/south-korea-drones-trnd/index.html