It seems it was
the fan club of the singer that doctored the photo and sendt it to the Korean media. The question remains why it did such a thing, though.
There was a birthday party for a Korean singer at Budoukan on July 12th, Japanese media and Korean media reported it. The top is from Japanese media and the below is from Korea media.
(It seems Korean media has changed the photo, but there is no denying the fact because there are several records.)