| In this on Saturday, July 4, 2020, photo, some 400 drones fly over the Han River showing messages of appreciation for medical workers during the coronavirus pandemic in Seoul, South Korea. The letters read ' Thanks to the people.' AP-Yonhap |
| In this on Saturday, July 4, 2020, photo, some 400 drones fly over the Han River showing messages of appreciation for medical workers during the coronavirus pandemic in Seoul, South Korea. Yonhap |
| In this on Saturday, July 4, 2020, photo, some 400 drones fly over the Han River showing messages of appreciation for medical workers during the coronavirus pandemic in Seoul, South Korea. Yonhap |
| In this on Saturday, July 4, 2020, photo, some 400 drones fly over the Han River showing messages of appreciation for medical workers during the coronavirus pandemic in Seoul, South Korea. Yonhap |
| In this on Saturday, July 4, 2020, photo, some 400 drones fly over the Han River showing messages of appreciation for medical workers during the coronavirus pandemic in Seoul, South Korea. Yonhap |
| In this on Saturday, July 4, 2020, photo, some 400 drones fly over the Han River showing messages of appreciation for medical workers during the coronavirus pandemic in Seoul, South Korea. Yonhap |
| In this on Saturday, July 4, 2020, photo, some 400 drones fly over the Han River showing messages of appreciation for medical workers during the coronavirus pandemic in Seoul, South Korea. Yonhap |
| In this on Saturday, July 4, 2020, photo, some 400 drones fly over the Han River showing messages of appreciation for medical workers during the coronavirus pandemic in Seoul, South Korea. Yonhap |