More than ten years ago, a murder occurred in City B. The fiancé of the deceased was Liu Dong, the deputy captain of the police force. This case has not been solved so far. New graduates Li Shu and Zhang Binbin who arrived at the police station put forward a new direction for the case. Can they use their spare time after solving their daily heavy work and the experience they have gained from accumulating cases to reveal the truth more than ten years ago?
