The Wonder Girls officially debuted in early 2007 on MBC's "Show! Music Core", performing "Irony", the hip-hop single from their first album, "The Wonder Begins". The album sold 11,454 physical copies in 2007. Shortly after, "Wonderfuls", the official Wonder Girls fanclub, was established. The group held several showcases in China after receiving Chinese lessons. In mid-2007, however, members of the Wonder Girls were beset by various injuries and health problems. On June 25, Sohee was sidelined for a month after tearing a knee ligament in a fall from a running motorcycle during the filming of the movie "뜨거운 것이 좋아" ("I Like It Hot").