Zhu Zhu goes knocking on doors to find her biological father Bo Yanzhou. Her cold-faced dad originally found her noisy, but gradually softened at her every single call; the troubled brother Bo Shiyu and the boarding youth Pei Du were also slowly melted by her innocence. With her innocent and carefree language, Zhu Zhu brought joy to the entire family, reaping the family's pampering all the way, and also guarded her dad and brother in her own way.