[BTS] BT21 x LINE FRIENDS flagship store Times Square NYC | I for Indy 

Date filmed: May 19, 2021
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BT21 is a group of animated characters created by K-pop band BTS
BTS is a seven member idol group, and BT21 is their creation in a collab with LINE Friends.
Each member created a character, and there's an eighth one representing the bind between the seven characters, like BTS is what binds the members.
Why BTS is also called BT21?
The name BT21 is a combination of the group's name BTS and the 21st Century. Member Suga commented that the name should represent both BTS and the 21st Century so they would live for the next 100 years.