Wonder Girls (Korean: 원더걸스) was a South Korean girl group formed by JYP Entertainment. The group debuted in February 2007 with the single "Irony" and 5 members: Yeeun, Sunye, Sunmi, Hyuna and Sohee. After Hyuna's departure in July, Yubin was added into the group prior to the release of their debut studio album, The Wonder Years (2007).

In early 2010, Sunmi left the group to pursue an academic career and was replaced by Hyerim prior to the worldwide release of the single "2 Different Tears" later that year. In 2015, it was announced that Sunye and Sohee decided to leave the group while Sunmi would resume promotion with the remaining members.

Album: The wonder begins
Track Number: 3
Date: 2007.02.13