According to a ZDNet report, the LG OLED TVs at Incheon Airport, installed only a few months ago, suffer from serious permanent image-retention, or burn-in. You can see the artifact at the top part of the TV in the photo below:
According to ZDNet, LG installed 29 such OLED TVs at the airport lobby in addition to 40 more units at four of the airport's lounges. These were installed in January 2018, only four months ago. LG Electronics did not comment on this story.