The K-pop sensation is bringing all the festive feels on “Dynamite (Holiday Remix),” which gives some seasonal bang to the group’s No. 1 hit.The surprise track — which, to the BTS ARMY’s delight, dropped early Friday — accentuates the already merry vibe of the original with some tinsel trimmings. The new remix comes with a video that finds the South Korean septet bopping around a Christmas tree to the Yule groove.