K-pop. Love it or hate it, it's here to stay. For a while longer, that is thanks to clever brand collaborations.

Renowned K-pop group BTS recently cooperated with Japanese designer Uniqlo to release special edition t-shirts.

These characters, called BT21, were designed by BTS. IMAGE: Uniqlo

These t-shirt designs were based off the iconic pop group's character designs, BT21, for Line which they did in 2017.

The collab-ception which features 12 designs of the t-shirts led fans to go crazy in Singapore and Indonesia. Long queues were spotted on June 21, the date the t-shirts went on sale.

Uniqlo is having a collab with bt21 and there’s a queue waiting for their release of bt21 shirts sdjdjdjsj pic.twitter.com/NXHBocCV7T — yoongi_wtf (@1307Suga) June 21, 2019

You might be wondering, "All for a bunch of t-shirts?" Yes, all for a bunch of t-shirts.

The line for Uniqlo x BT21 lol ALMOST ONE WHOLE ROUND AT CWP LMAO SG ARMY POWER HAHAHA pic.twitter.com/YR0YdUo4Qy — 😺 (@monmonbii) June 21, 2019

In Singapore, some fans began queuing up a day in advance. They don't call these guys the BTS army for nothing.

BT21 designs will be available at Uniqlo SG starting tomorrow and at Somerset branch, there’s queue already 😅 What’s the chance of me and mom getting ours 🥺😭 Some more, you can only purchase 1 item per transaction 😭😭 pic.twitter.com/ipWuMC0XXA — 🌻최 씨 부인🌻 (@xmrschoix) June 20, 2019

Singaporean fans were only allowed to purchase one design per customer. We believe it's a clever way to deter scalpers.

The long queues were spotted at Jakarta's Kelapa Gading La Piazza Mall in Indonesia.

Here's a video of a lengthy queue spotted at the Uniqlo store in Grand Indonesia. Crazy.

Cover image sourced from Summarecon Mall Kelapa Gading and Singapore Atrium Sale.