Zhou Lan returns from a business trip only to discover that her mother, Liu Sufen, has been forced out of her own home. The house was originally lent to her brother-in-law, Chen Jianwei, for a short stay, but an unfamiliar agreement suddenly appears, along with a demand for 400,000 yuan in renovation compensation. As Zhou Lan investigates, she discovers that her mother's money has been transferred away, the house has been altered without permission, and her husband, Chen Jianguo, has been concealing the truth. Caught between family ties and financial interests, Zhou Lan gradually gathers evidence and uncovers the secrets behind the agreement. In the end, she protects her mother's home and makes everyone face the consequences of their choices.