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The Wonder Girls debuted on February 14, 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.[7]

Out of the members, Sun Ye was the first one debut in the industry through the program called 2001 Park Jin Young's Challenge of 99%. However, 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 contained each members' characteristics and profiles (except Ye Eun's), and showcased their schedules for the day. In the fifth episode, Ye Eun appears in the JYP audition for the search of 5th member. She battled against other final three contestants, and eventually her strong vocal and dance-style won her the fifth member spot of the Wonder Girls.[citation needed]

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 "Don't Cha" by the Pussycat Dolls and their own songs, such as "Irony" and "미안한 마음" ("A Sorry Heart"). Sun Ye did the solo by singing Destiny's Child's "Stand Up for Love" while Hyun-a showed her dance skills by doing solo dance. The other three members — Ye Eun, Sun Mi and So Hee — performed Janet Jackson's "Together Again".