V& Kookie became popular, Twitter in Japan

In the twitter after 20171222 BTS "Music Station" in Japan, these two boys were very popular.the boy who is Blonde, white shirt, black tie and another one who is black hair, baby face, ....who are they? What's their name? The tweet that flies about both. It was said that the ARMY of 5000 members increase over that night.
This big fever continues even now！！