On June 12, 2023, the gossip website "I Heard Behind the Scenes" published an article about the debut of Choi's Stars Entertainment's new group, titled FourFênix. The article described the group as: "an improved version of InFire." On August 29 of the same year, the duo "The beginning," formed by trainees Junseo and Jungyong, released the OST "Yesterday" for the drama *I Got You* (나는 당신을 얻었다). On December 11, Choi's Stars Entertainment posted a photo of the duo The beginning on its social media. A second photo was posted hours later, featuring three other members and the phrase: "of a new era".