So this is the pre-release version of ZE:A4U Only One 4 U which is co-composed by Junyoung with his team(Supermarket) and co-written by Taeheon for raps lyrics...there's some difference with the officially released one. i personally like the arrangement for the released one better...it's smoother...but i love live performances too. so here.

and here's the released version if you missed it.