Reborn as a Pure Stepmother, but the Evil Mother System Arrived?

I was reborn, and though my character setting was supposed to be a pure stepmother, I awakened an evil mother system instead. There’s no way around it—forced by the system, I can only reluctantly mistreat my daughters… The system wants me to punish you so that for three meals you can only drink plain porridge and eat steamed buns, with even pickled vegetables rationed! Instant noodles are absolutely forbidden from having eggs or sausages added! You can only wear patched clothes! All the heavy and tiring work must be done by you! I’m truly a terrible mother… What? Why are you crying? What do you mean plain porridge and steamed buns taste really good? What do you mean having clothes to wear...