The Wonder Years

The Wonder Years is the debut studio album by South Korean girl group Wonder Girls. It was released on September 13, 2007, by JYP Entertainment. The album produced two singles, "Tell Me" and "This Fool". "Tell Me" was a success, topping various musical charts. Original member Hyuna left the group two months before the album was released and was replaced by Yubin. Because of this, Hyuna's vocals are still featured on the album. Yubin only appears on the rap version of "Tell Me" and the track "Wishing on a Star". The Wonder Years also includes songs first featured on their debut EP The Wonder Begins, which was released earlier that year. Background Wonder Girls were formed in 2006 by Park Jin-young as part of the television reality show MTV Wonder Girls (2006–2010), during which they held their first performances, rehearsals, and recording sessions. The group released their successful debut single "Irony" in February 2007. The same month, their debut EP The Wonder Begins was released which featured the follow-up singles "Bad Boy" and "It's Not Love". In July 2007, the original group member Hyuna left the group due to health problems and was replaced by rapper Yubin. Release and promotion The Wonder Years was physically released in South Korea through JYP Entertainment and LOEN Entertainment on September 13, 2007. The same day, the album was released for digital download worldwide and on US iTunes Store through JYP Entertainment. It was also physically released in Thailand through recording label G"MM' Grammy. The album was promoted with various live performances, including a guest-performance at the 2007 spring festival of the Hanyang University. The Wonder Girls embarked on their first Asian tour in 2009 before their world tour the following year.