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The Wonder Begins
- Wonder Girls
- The Wonder Begins
- Bad boy
- Mianhan Maeum (미안한 마음; A Sorry Heart)
- Irony (Tae Kwon - daybreak Remix)
"The Wonder Begins" is Wonder Girls's debut single. The song "Irony" was used as lead track followed by Mianhan Maeum. The single was released and promoted before Hyun A's departure from the group. It sold 14,815 copies.