Rainbow sings "Sweet" for Rainbow Dose OST! AudioDKPOPNEWS OfficialSep 06, 2012 Share 0 comments Rainbow sings the OST song titled "Sweet" for KARA Jiyoung's upcoming drama "Rainbow Dose",check out the adorable song below! Tags: Audio, Kpop, Rainbow Share Previous articleNext article Leave a comment Name Email Content Post comment