Marry a Woman Three Years Older and Strike Gold

Feng Qingyan has a boy living next door. Feng Qingyan has always treated him like a younger brother. But one day, the boy grows up and tells Feng Qingyan, "In this life, I, Shen Lingye, will marry only Feng Qingyan." Feng Qingyan is stunned. "Wait, I'm three years older than you. I'm your big sister, and I treat you like my little brother." The boy says, "That's fine. They say a wife who's three years older is a treasure, and I've thought of you as my future wife since I was little." Feng Qingyan: "..."