Caifu Ziyou Hou, Tamen Xianshangle Zhongcheng

Handsome rich kid Shen Yuan's family business collapses, turning him into someone in deep debt. His gold-digging ex-girlfriend ruthlessly dumps him. However, this leads him to obtain the Perfect Life System. As long as he spends money on women around him with a favorability rating of 60 or higher, he can get double the cashback. From then on, he cleverly utilizes the system, winning the hearts of beautiful women and earning a fortune. The more money he spends, the richer he becomes, living a life of extravagant spending as a top-tier tycoon, enjoying happy entrepreneurship and a harem of beauties.
(Source: Kuaikan, translated)