In addition to Hyerim and the individual who left the group in January 2010 to pursue her academic career, Lee Sun-mi and Yeeun were the other two final members of the group whose third mini album was named Wonder Party.
Wonder Girls () was a South Korean girl group and band formed by producer Park Jin-young under JYP Entertainment in 2006, which debuted in 2007. 
 The group's final line-up consisted of Yubin, Yeeun, Sunmi and Hyerim. 
Lee Sun-mi (born May 2, 1992), referred to as Sunmi, is a South Korean singer. 
 She debuted in 2007 as a member of South Korean girl group Wonder Girls and left from the group in January 2010 to pursue her academic career. 
Wonder Party is the third mini album by South Korean girl group Wonder Girls. 
