Agile, youthful and sunny Zhong Aifang (Charlene Choi) has finally become a police officer like her father, a part-time worker (played by Hui Siu-hung). She encounters a major case on her first day at work. In order to testify against the gangster Tianye (played by Wang Jing), the crime team is looking for the important witness Fei Wei (played by Lin Xue), and Tianye also wants to kill...