Although Sechs Kies disbanded in 2000, in 2002 Eun performed with former member Kang Sung-hun and J-Walk Kim Jae-duck and Jang Su-won. In 2007, he performed with J-Walk on a number of music shows, including KBS' "Yoon Do Hyun's Love Letter" (where they performed the SechsKies song, "Couple") and "Music Bank" (performing Eun's "Adios" and J-Walk's "Light Storm"). Eun and J-Walk performed "Couple" at Lee Soo-geun's wedding on March 2, 2008. Eun was featured on the third J-Walk album's title track, "My Love" and in its music video.