#TBT to the best day with ATEEZ & ATINY! TAKE US BACK But, don't be too sad! Stay tuned for Undercover82 coming soon! August 31, 7PM PDT https://t.co/xEP4ITetKs@ATEEZofficial#ATEEZ #에이티즈 #hello82 #hello82LA #BOUNCY_Challenge #hello8…