The story takes place in Yunjiang City. Single dad Song Jianming was transferred from the criminal police team where he had worked for many years to the public security brigade as captain. The first thing he did when he took office was the newly established training team. Facing a group of reserve policewomen who were more beautiful than flowers, Song Jianming had a headache. Rich girl Ning Meng signed up for the police training without telling her uncle Yi Qingchen, but her good luck seemed to slip away the moment she stepped into the training team. When she found out that the instructor was actually her uncle Song Jianming, with whom she had fought because of a misunderstanding, her rebellious heart arose spontaneously. Because of a chance encounter, Wang Kefei took Ning Meng to heart, and his friendship with Yi Qingchen, the president of Yi's company, made him meet Ning Meng again. Wang Kefei regarded this encounter as destined, and couldn't wait to share it with his good friend Song Jianming, but he didn't know that the fate of the three people had been intertwined. After Song Jianming's cold training, Ning Meng, Yi Diandian, Li Lucy and other delicate girls have made a gorgeous transformation and officially put on police uniforms - but for Song Jianming, this is the beginning of his headache as a captain. In order to be a police officer, Ning Meng refused to inherit her uncle's company. By coincidence, she lived next door to Song Jianming, and from then on she started a hilarious "Full House" life with this cold-faced captain. After a series of changes at work, Ning Meng gradually discovered Song Jianming's gentleness and thoughtfulness hidden under his cold face, and Song Jianming also gradually discovered the kindness and courage of this rich girl. With the clever and lovely little Niuniu as the bond, Ning Meng and Song Jianming are getting closer and closer... Li Lucy, who grew up in a police family; Su Yilin, who went to the border with the goal of fulfilling his father's dream and defending his country; Wu Bin, who was wearing a police uniform but had a dream of literature; Ding Ping, a female man who worked like a "workaholic"... A group of young people have dedicated their youth and passion to the cause of the people's police. While helping the people solve their problems, they are also worried about their love and family.