In light of the upcoming girl group's debut project, the Green Light Project, Seoyoung released her cover of 5 Seconds of Summer's Youngblood on the 11th of December.

During the Green Light Project, the six members of ALLS-GIRL (Seoyoung, Yuha, Yeonchae, Yujin, Ria and Garam) release covers (both dance and vocal) of songs and artists that have inspired them to become singers themselves.