If you want to make a BTS video viral, you can link to the official BTS YouTube channel (BANGTANTV) or their other official social media pages in the description. Apart from this, you can also use hashtags related to the video, such as #BTS, #방탄소년단, and #ARMY, so that more people can see your video.   

In detail:

Official Youtube Channel:

BTS's official YouTube channel is BANGTANTV, where all of their official videos are uploaded. You can give the link of this channel in the description of your video so that people can easily watch their other videos also.   

Other official social media:

You can also link to BTS’ other official social media pages such as Twitter, Instagram, and Weverse.   

Hashtags:

Using hashtags will help more people see your video. You can use #BTS, #방탄소년단, #ARMY, and other hashtags related to the video.   

Link to specific video:

If your video is of a particular song or performance, you can also provide a link to that video.   

Links to other related videos:

If your video is on a particular topic, you can also give links to other related videos.   

Example:

"This video is from BTS's new song! Watch and like it! [Link to official BTS YouTube channel] #BTS #방탄소년단 #ARMY"

"Check out this amazing performance from BTS! [Link to exclusive video] #BTS #ON #ARMY"

"Check out this fun episode of Run BTS! [Link to Run BTS] #RunBTS #BTS #ARMY"   

It is important to note that you only use official links and hashtags, so that your video reaches the right audience If you want to make a BTS video viral, you can link to the official BTS YouTube channel (BANGTANTV) or their other official social media pages in the description. Apart from this, you can also use hashtags related to the video, such as #BTS, #방탄소년단, and #ARMY, so that more people can see your video.