I Transmigrated to Ancient Times and Bound Myself to a Get-Rich System

Tian Tian wakes up from a nap to find that the world has changed. There's a new word in her life: poverty. She has a new little brother, and a Spatial System. Life is hard. You need someone powerful backing you up! You there, big shot... ahem, my lord, what do you think of me? Am I to your liking? Could I cling to your coattails?