Super Junior’s Leeteuk revealed his sexy backside. On August 13, he tweeted, “Clothes with back wide open. You didn’t know? I’m going to delete this so take a look fast,” and attached a selca. In the photo, Leeteuk wore a black halter that exposed his back. Fans were especially drawn  to his firm, muscular back and arms.

Netizens commented, “Haha, his muscles are so sexy,” “When did he get so fit,” “Thank you for sharing this photo,” “He looks like Lee Jun Ki with that hair,” and more.

Meanwhile, Leeteuk and fellow Super Junior members performed their new follow-up song, “Spy” on “Inkigayo” yesterday night. According to Gaon Charts, Super Junior’s sixth album, “Sexy, Free & Single,” sold 335,744 copies in July, coming in first for selling the most number of albums that month. BEAST’sMidnight Sun” was a distant second, selling 67,956 albums.