Lin Zhiyuan, from a poor family background, almost dropped out of school due to tuition fees. Classmate Su Wanqing stepped in to help multiple times, helping him overcome difficulties in his studies. The two lost contact after graduation. Twenty years later, Lin Zhiyuan, already the chairman of a building materials group, learned that his benefactor Su Wanqing had been plotted against by her ex-husband, cheated out of all her assets, and could only make a hard living selling tofu while raising her daughter alone. Lin Zhiyuan resolved to repay the kindness, hiring lawyers and gathering evidence to help Su Wanqing fight a lawsuit against her vile-mannered ex-husband. After enduring public opinion framing and malicious retaliation, Su Wanqing took back her own property. She founded a soy product brand to achieve self-growth, and the two accompanied each other once again, continuing the decades-spanning kindness of classmates.