Lai Yiqiu (played by Bosco Wong) has a childhood that he cannot bear to look back on. When he grew up, he joined the police force and became a dog handler. What Lai Yiqiu did not expect was that the police dog he was assigned to, Ba Da, was actually a watchdog kept by a drug lord. Not only that, there was a vicious fight between the man and the dog. The old grudges made the relationship between Lai Yiqiu and Ba Da very unharmonious, and conflicts occurred repeatedly. Veterinarian Ma Zhihao (played by Linda Chung) saw all this. Under her guidance and mediation, Lai Yiqiu and Ba Da established a bond and trust, and he and Ma Zhihao became closer and closer. Ma Zhihao has a mother with a strong desire for control, who arranged her entire life. Becoming a veterinarian is a signal for Ma Zhihao to declare independence, and she and her mother parted ways. The appearance of Lai Yiqiu became a lubricant for the relationship between mother and daughter, and Ma Zhihao gradually learned how to get along with others. A relationship of mutual trust and mutual dependence began.