Yoojung writing raps again!
September's Release is Elly, a duet with Herz Analog. August's release was Lucy and Astro's MJ (which OP totally missed)
sources: @fantagiomusic_ 1, 2, 3, 4, GangXorcA
omona, are you ready for Teen Crush™ idols Weki Meki once again?