On May 12, 2025, RUN Entertainment posts another video, revealing the second member of their new girl group Next RUN Girls (tentative name), the member's name is Kim Sungyeon, in the video she makes a cover of John Legend's All of Me. Kim Sungyeon is a South Korean trainee, before joining RUN Entertainment, she has trained under two other companies, KROMS Entertainment and Preesm Entertainment, not only she has excellent vocal skills but she has talented songwriting skills as well.