Zhang Yanan was originally an ordinary housewife. One day, her husband Zhang Li, a policeman, mysteriously fell into the sea and disappeared while on the way to work, leaving her and her only son Xiaoqian with unpaid debts. This sudden accident caught Yanan off guard; in order to make a living, in addition to working as a cleaner at the police station, she also worked part-time cleaning up the crime scene, while secretly investigating the truth of her husband's disappearance. Inadvertently, she met Xiaoxue, who worked as a broadcaster at the hotel, and the two became close friends. Influenced by Yanan, Xiaoxue decided to get rid of the days of decadence and become a murder scene cleaner. Yanan and Xiaoxue worked together to face various challenges in life, and as they were heading towards a stable and down-to-earth life, the truth of Zhang Li's disappearance was about to come out...