Age: 23
The replacement to the group’s former main rapper Hyuna, Yubin made her Wonder Girls (yes, the band that gave us the cutesy dance to "Nobody") debut in 2007 with their single “Tell Me.” In addition to writing songs for Wonder Girls, including “Sweet Dreams” and “Me, In,” the adorable lyricist writes songs for other solo artists, such as the track “Do You Know That?” for South Korean R&B singer Kim Bum Soo.