Su Wan and her husband Zhou Yu have a daughter, Tian Tian. At the Mid-Autumn family banquet, Zhou Yu's first love Jiang Man brings two boys to claim kinship, and mother-in-law Zhou Mu, due to son preference, publicly forces Su Wan to divorce and step down. Su Wan calmly gathers evidence and legally defends her rights. With a lawyer's assistance, she confirms through an evidence chain that Jiang Man's claims do not match facts and ascertains that the two children have no blood relation to the Zhou family. Ultimately, Su Wan and Zhou Yu legally divorce, take back the house, win custody of their daughter, and have the daughter take her mother's surname. Zhou Mu and Zhou Yu are filled with remorse in the face of the truth.