Bae Seul-ki studied Theater and Film at Sangmyong University, then made her entertainment debut in the fall of 2005 as part of the project group The 빨강 (The Red) with actresses Oh Seung-eun and Ju So-young, which allowed her to gain stage experience and fame before her solo debut.

The first single from the album, "강한 여자" (Ganghan Yujah, meaning "Strong Woman"), had Carlos from the Korean rap group Uptown and featured Bae with many B-boys in a heavily choreographed breakdancing routine.

However, this single was quickly abandoned after a few weeks in favor of "말괄량이" (Malgwalyangee, meaning "Tomboy" or "Sassy Girl"), a song with a cute, light feel.

[4] After promoting this single on the various music programs, Bae sang a duet with Glass Box on a charity album called Mind Bridge.

In May 2007, Bae made a guest appearance in the music video for Banana Girls' "Chocolate" alongside other stars such as Kan Mi-youn.

[5] Returning with a new image after the success of "Strong Woman" and "Tomboy," Bae released her second album on October 8, 2007, titled Flying.

She also hosted MBC's Music Show with Brian Joo from Fly to the Sky, acting as a guest MC in place of Kim Hyun-joong from SS501.

She was cast as the lead actress in the hip-hop drama Groove Party (also known as Hot Dance World), a China-Korea collaboration.