http://images.china.cn/site1000/2020-06/25/1dd1b3b4-9f22-4ebe-9a02-9a2f2b6ff6c1.jpg
Since April 16, 2020, a blue lighting activity is held in Seoul, South Korea, in order to express gratitude and respect to medical personnel working on the front lines day and night.
courtesy of the Seoul Metropolitan Government