After his wife's death, Chen Kai raised his daughter Duoduo and cared for his paralyzed father while working hard. He hired nanny Lin Qiaoyun, who seemed gentle but secretly abused the voiceless old man and coveted the family's money. Duoduo recorded the abuse on her phone watch. Chen Kai uncovered the truth, worked with police, and caught the nanny and her accomplice. Justice served, the family found peace again.