"Rokkuko" (Korean: !!!) is the first CD single by Super Junior-T, released on February 23, 2007. Over 45,998 copies were sold by the end of the year, marking it Korea's sixteenth best-selling record and no1 best-selling single of 2007."Rokuko" has been one of Super Junior's most well-known songs.Super Junior-T re-released this single in Japan on November 5, 2008, collaborating with the Japanese female comedy duo, Moeyan."Rokuko," or "Rokkugo," ( ) is "gokkuro" ( ) spelled backwards, a term meaning "backwards" or "opposite." The single is promoted as a trot single, although heavy modern K-pop influences can be heard in each track, such as rap and stylized modern K-pop rhythms. The music video features fellow label mate Isak as a comedic rabbit who was playing Whack A Mole with the members as the targets.