Welcome 1 shot,
That's an interesting middleweight frame with a style that could be the basis for a neat skinny(ier) tire build.
The 3 piece crank says to me that it is likely a European built bike(Czek,Polish, Hungarian, German perhaps) and may offer a bit of a fun challenge in itself to disassemble, especially if threaded.
MBS is possibly a small store brand such as Moms Bike Shop. Maybe pick a bit of paint off badge to reveal more info with fingernail. (Oven cleaner or careful wet sanding can remove paint by layer to reveal original decals,details pinstripes etc if you wish.)
Is it chrome frame or silver base under translucent red?
It's a pretty unique frame (especially for $20) to do what you want with and any help needed along the way is on this site.