MAMAMOO is celebrating their 12th anniversary with the release of the special single '4WARD' and the launch of their '4WARD' world tour, which has sold out in Seoul, Kaohsiung, and Macau, while member Hwasa performed despite a knee injury. The group also revealed concept photos and teaser videos for '4WARD' and '4 Flowers', and announced additional concerts in Macau and Singapore.