After Sister Zheng (played by Zheng Yuling) returned from Hong Kong, her work performance was highly recognized by her superiors. Her position was promoted and she and her assistant with special powers, A Sheng (played by Zhang Jianting), were responsible for training police officers. On the other hand, Mr. Wu and his nephew Ah Xiong (played by Li Zixiong), a Hong Kong policeman, came to the mainland to visit relatives. Ah Xiong...