Korean Wonder Girls

As a group, the Wonder Girls were introduced through the program called MTV Wonder Girls which was filmed and directed by MTV. The first four episodes outlined the characteristics and profiles of each member and showcased their schedules for the day. Not long after selecting Ye Eun as the fifth member, the Wonder Girls had their showcase in the MTV Studio. In the showcase, they performed a cover of "Don't Cha" by the Pussycat Dolls and their own songs, such as "Irony" and "미안한 마음" ("It's Not Love"). Sun Ye did the solo by singing Destiny's Child's "Stand Up for Love" while Hyuna showed off her dancing skills with a solo dance. The other three members — Ye Eun, Sun Mi and So Hee — performed a cover of Janet Jackson's "Together Again".
The Wonder Girls officially debuted in early 2007 on MBC's 쇼! 음악 중심 ("Show! Music Core"), singing "Irony", the hip-hop single from their debut mini-album, The Wonder Begins. The mini-album sold 11,454 copies in 2007. The Wonder Girls official fanclub was established, with the name of "Wonderful". Additionally, the group did several showcases in China after receiving Chinese lessons. Throughout the rest of 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 falling off a motorcycle during the filming of 뜨거운 것이 좋아 ("I Like It Hot").The remaining four members continued performing until late July, when Hyuna was removed from the group by her parents due to their concern over her health—in particular, chronic gastroenteritis and fainting spells.In the autumn of 2007, Good Entertainment, the talent agency sent their trainee Yubin to JYP Entertainment as a replacement for Hyuna. She made her debut three days later in the group's live performance of "Tell Me" on Music Bank .
Their first full-length album, The Wonder Years, was released the following week with "Tell Me." Due to the last-minute addition of Yubin, the album version does not contain her part. However, the performance version of the song was reworked to include a bridge with rapping by Yubin. The single was a hit and reached number one on various Korean television and internet music charts, including KBS's Music Bank.The choreography for the song was simple and widely imitated: by October, many fan performances of the dance circulated on video sharing sites such as YouTube and Daum,including one by a group of policemen who were eventually profiled on SBS's Star King. The dance became so popular it was known as the "Tell Me Virus" and earned them the title of 'Korea's Little Sisters'.Videos of the dance came from fans in France and the Philippines, and the song also went to Number 1 in Thailand.
The Wonder Girls had an extensive promotional schedule for their album and in late 2007 they began performing the second single from the album, "이 바보" ("This Fool"). They made numerous appearances on variety and game shows, sang live on radio, at music festivals, on music shows, and in special joint performances with other groups such as Big Bang and Girls' Generation. MTV has also aired three seasons of The Wonder Life, a reality TV series starring the girls. The Wonder Girls returned to Korea in spring of 2008. In May a picture of each member was released over five days starting with Ye-eun and ending with Sohee. A preview track from the upcoming single was then released. There were rumours that past member Hyuna would be returning to the group; JYP Entertainment confirmed that this was not the case.Their new single, "So Hot", was released on May 22, 2008; the song topped online charts soon after. They then performed in mid-2008 on MBC's Music Core, performing "So Hot" and "This Time". The full single was released soon after containing the title track, the rap version of "Tell Me", "This Time", and "You're Out". Due to vocal cord problems, Yubin temporarily lip-synched her parts under doctor's orders.