In relation to this post, it already stated that Jaejoong and Yoochun performed 3 songs, COLORS, True LOVE (a collaboration with the original singer Fumiya Fujii).

Music Fair PD Kikuchi revealed the third performance, and it is

Kazuyoshi Saito x JEJUNG & YUCHUN – 歩いて帰ろう (Let’s Go Walking)

The Music Fair will be broadcasted on 26th of September, 2009.