During the segment where Jin taught Jimmy Fallon the Super Tuna dance, a brief moment caught fans’ attention. His shirt lifted slightly as the idol demonstrated the moves, revealing his toned abs.

BTS singer Jin returns to No. 1 on the World Digital Song Sales chart with his single "Super Tuna," which has already spent time in first place. (Photo by The Chosunilbo JNS/Imazins via Getty ...