GRID Entertainment unveiled two new additions to their talent lineup, Leo and Sangwon, on May 24 KST. The agency presented the pair as a duo under the theme "Bound as One, Leo & Sangwon" and shared stylish profile pictures of the artists.

Leo and Sangwon were previously part of Trainee A, a group that was supposed to debut under Big Hit Entertainment in 2022. Unfortunately, the group's debut was canceled in December of the same year, leading all six members to follow their own paths. Yorch, another former Trainee A member, joined GRID Entertainment's boy group POW and currently serves as its leader. The team of five is preparing for a comeback on June 27.

After Trainee A disbanded, Leo signed with 131 Label and ventured into a solo career. In August 2023, he made his solo debut with the digital single "One Look."

Additionally, fans have noticed the transformation of IVE's An Yu Jin, praising her enhanced appearance.