Lee Sun-mi, known mononymously as Sunmi, is a South Korean singer and songwriter. She debuted in 2007 as a member of South Korean girl group Wonder Girls and left the group in 2010 to pursue an academic career.
Choi Soo-young, professionally known as Sooyoung, is a South Korean singer, actress and songwriter. She was a member of the short-lived Korean-Japanese singing duo Route 0 during 2002 in Japan.