There was the planking challenge, the mannequin challenge, and now, the latest trend to take social media by storm is the "invisible box challenge."
원문출처 : http://www.cnn.com/videos/us/2017/12/04/invisible-box-challenge-orig-trnd-lab.cnn
원문출처 : http://www.cnn.com/videos/us/2017/12/04/invisible-box-challenge-orig-trnd-lab.cnn