It all started last week when Japanese broadcaster Asahi unexpectedly dropped K-pop boyband BTS from its music show line-up, after a picture of one of its members wearing a T-shirt with a seemingly politically sensitive message had gone viral, much to the chagrin of Japanese netizens. The hugely popular seven-member group was due to perform on music variety show Music Station on Nov 9, but the Japanese broadcaster withdrew the invitation just one day prior.