BTS’ Suga made a surprise appearance at a recent Psy concert for a performance of their recent single ‘That That’.On Saturday (July 16), Psy’s annual ‘Summer Swag’ concert made its return for the first time since the beginning of the pandemic. The concert, held at the Jamsil Olympic Stadium in Seoul, took place just a day after the tenth anniversary of Psy’s smash hit ‘Gangnam Style’.During the show, Psy surprised fans by inviting Suga on stage for a performance of their latest single ‘That That’, which the BTS rapper had also helped produce.