What is BT21? I'm pretty new to the BTS ARMY and I see BT21 being talked about a lot when BTS is brought up. Is it a BTS thing? What is the
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Amazon.com: BTS Theme Birthday Party Decorations, BT21 Junior Combination Party Decorations for Army Fans Include Cartoon Happy Birthday Banner,Stickers,Cake Cupcake Toppers and Cartoon Balloons Party Favors for Kids : Toys & Games
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