Just found a hidden barber shop at the ground floor of DeCentrum Mall. It's located inside a mini market at the ground floor of DeCentrum Mall.
It's quite a creative move by the tenant to sublet to a barber shop, only thing is the barber shop is not so visible.
I also know there's another modern looking barber shop at the 2nd floor of DeCentrum Mall called Beast. That's a story for another day.