'Effortless' marks A.C.E's new release after 2 years and 2 months, following their repackaged album "Changer: Dear Eris" from September 2021. During this period, members Park Junhee, Lee Donghun,WOW and Kim Byeongkwan have completed their military service. The youngest member, Kang Yoochan, is currently serving in the military and could not participate in this release.