Chang Ya-nan was once a student at the police training school. Due to health issues, she had to abandon her training and later married a police officer. Tragically, after several years of marriage, Ya-nan’s husband suddenly passed away. Forced to support her family, Ya-nan had to work as a cleaning staff member handling special cases at Sunshine Cleaning Company. Unexpectedly, this job brings her into contact with a group of colleagues, leading to workplace relationships that, although appearing on the fringe, contain warm human connections.
Zhang Yanan was originally an ordinary housewife. One day, her husband Zhang Li, a policeman, mysteriously fell into the sea and disappeared, leaving her with her only son Xiaoqian and unpaid debts. In order to make a living, she worked as a cleaner at the police station, and also worked part-time cleaning up crime scenes, while secretly investigating the truth behind her husband's disappearance. She accidentally met Xiaoxue, who worked as a hostess at a hotel, and the two became close friends. Influenced by Yanan, Xiaoxue decided to break away from her life of luxury and become a crime scene cleaner. As Yanan and Xiaoxue worked together to face various challenges in life and gradually moved towards a stable and secure life, the truth about Zhang Li's disappearance was about to be revealed.