sentences:  Following the addition of thirteenth member Kyuhyun, the group dropped the suffix "05" and became officially credited as Super Junior.The re-polished group's first CD single "U" was released on 7 June 2006, which was their most successful single until the release of "Sorry, Sorry" in March 2009.Through their first official album, Eunhyuk helped produce as a lyricist and wrote the rap lyrics for a majority of Super Junior's songs.