After Zhou Xiake failed her second class, she was suddenly linked to a traffic accident, and relevant clues pointed to her. As the investigation deepened, the police discovered that there was another hidden secret in the case. Zhou Xia actually had an identical twin sister Lin Nian who was taken away many years ago. It turns out that thirty years ago, Zhou Xia's father, Lin Nian's mother, Lin Hui, and others concealed a past and provided false explanations. Lin Hui had a grudge and took her daughter Lin Nian away. Years later, she tried to seek justice in her own way. In the end, the truth was revealed, Lin Hui was dealt with according to law, Lin Nian was out of trouble, and Zhou Xia's father took the initiative to assume corresponding responsibilities. This dispute that spanned thirty years finally came to an end.