Poor Senior Student: Cash Back 10,000 Times as Much as You Spend

[The protagonist has three views, single female protagonist or no female protagonist] On the day we broke up, my ex-girlfriend said, "You can't give me the life I want." Three months later, when she saw me swiping a credit card of 8,400 yuan at the entrance of the supermarket, her eyes widened. In my senior year, I was connected to the 10,000-fold cash back system - if I spent two yuan to buy water, I would receive 20,000 yuan in my card; if I spent 680,000 yuan to buy a house, I would receive a cashback of 6.8 Billion. Everyone thought I was still the poor student who couldn't even afford an eight-yuan vegetarian meal. They don't know that the fraction of my money is enough to buy their boss's company. Others rely on staying up late to take the postgraduate entrance examination, but I rely on krypton gold. Others are trying their best to save money, but what worries me is - how can I spend all the money?