ID an old (possible) Exo song?

Hey there please lmk if there’s a better sub to post this in!!

I’ve been getting back into Exo after several years, and there’s this tune floating around my head that I swear my brain remembers Xiumin singing. (If it’s not Exo and it’s from a different K-group then omg I’m so sorry; I will be mortified). It sounds like one of their more lighthearted, pop-y songs, I thought from maybe XOXO album, but I went through those songs and they don’t seem to match up. Am thinking it could maybe be a solo song, perhaps for a drama that Xiumin was in? But definitely pre-CBX era!

The lyrics of the hook (which I tried playing on a digital piano above) go kind of like “baby, baby, my baby” and then there were little ad libs were done by a girl sounding voice?

Thank you anyone in advance who can help me find it !! (and pls forgive my piano playing TT)