Across the Eras of Big and Small Ball, the Combination of Curry and Shark

No system + non-rebirth + hot blood (PS, it's very strange that the setting of rebirth was changed when I was tens of thousands of words long. I don't know why many readers reported that it was rebirth, haha) The family is in decline, and her father works several jobs a day, aging prematurely and with gray hair; her mother, who was originally a noble lady, has become the butt of ridicule; her younger sister, who was once the jewel in the family, now cannot afford to go to kindergarten; and her childhood sweetheart also looked down on her and followed someone else. Luo Ran, a 13-year-old boy who was forced to use his identity as a mother to deliver food, dreamed of changing everything. Looking around, only basketball was the only way to fight and change his life. This is the story of a talented young man who constantly trains and breaks through himself without any systematic flow. It's a bit slow and hot, with the protagonist growing up step by step. If you find it slow, the book is also divided into chapters.