Retired police dog handler Chen Tieshan lives with his old police dog, Huzi. When his daughter Yueyue brings her boyfriend Xu Jiayan home, Huzi suddenly sounds an alarm. Chen Tieshan thus senses something unusual, but is treated by everyone as a paranoid father. As Yueyue's engagement approaches, the truth behind the family-finding association gradually surfaces, and the daughter also steps into danger step by step. In the end, Chen Tieshan teams up with his old partner to investigate, successfully rescuing the trapped girl and uncovering an old case from years ago. Yueyue finally understands her father's protection and Huzi's loyalty, and the father-daughter relationship also welcomes a new beginning.