Sister Lei is a strong woman. Her husband died of illness ten years ago, and she took her son alone from junior high school to high school, and from high school to Dalian University of Technology. Although life was difficult, she received help from her husband's college classmates and from the parents of her son's classmates... But she never once opened her mouth to her husband's workplace. When her son was about to enter college, she came to her husband's workplace for the first time to raise tuition, a place that she did not dare to set foot in...