Actor Lee Sang Yup went total ARMY-mode as he attended BTS's 'PERMISSION TO DANCE ON STAGE - SEOUL'!

Back on March 11, Lee Sang Yup shared that he had a great time at Day 1 of BTS's 'PTD ON STAGE - SEOUL' via his Instagram. The actor was seen posing with a purple cover in his seat, and also held up a fan-made sign with the camera pointed toward the stage. He wrote, "#LivingUpToTheirName #BTSForeverTheBest #ARMYWhoBecameOneAgainAlsoTheBest #ThankYouSeokJin #AcceptMyFormalBowOfGratitudeNextTimeWeMeet."

Meanwhile, fans noticed Lee Sang Yup thanking BTS member Jin for inviting him to the Seoul concert, and are now wondering how the actor became acquainted with the BTS member!

Are you wishing you could have been Lee Sang Yup a few days ago?