Tiny Grass, Bounty of the Sun

The male lead, who came from a poor family, was able to study abroad thanks to his mother's full support. Over the next ten years, his mother fell ill due to years of overwork, and his sister struggled to support the family alone. Meanwhile, the male lead remained out of contact, leading to rampant rumors in the village. At a critical moment, when debtors forced his mother to kneel and repay the debts—even attempting to make his sister marry to settle them—the male lead returned in glory. He not only repaid the debts in full but also announced plans to invest heavily in revitalizing his hometown, completely changing his family's destiny.

Synopsis from DramaGo.