San E
The album marked the point where the members were more involved in the songwriting in production: Park Yeeun wrote and produced "G.N.O." and "Me, In", Kim Yubin wrote "Girls Girls", "Me, In" and "Sweet Dreams" while Woo Hyelim wrote and produced her solo song "Act Cool", featuring San E. The members also recorded two duets: Min Sunye and Yeeun recorded "Long Long Time" while Yubin and Ahn Sohee recorded "SuperB".