After returning from Hong Kong, Sister Zheng (played by Cheng Yuling) has achieved great work performance and has been highly recognized by her superiors. Her position has been improved and she has served as training for police officers with her assistant Asheng (played by Zhang Jianting).On the other hand, Mr. Wu and his nephew Ah Xiong (played by Li Zixiong), who is a Hong Kong policeman, came to visit relatives in the mainland. Ah Xiong encountered a murder case in the hotel where he was staying, and was forced to stay by Sister Zheng who came to investigate the case.Mr. Wu, who was busy looking for Taiwanese spies, met a group of scammers. Ah Xiong, who was abandoned, moved into Sister Zheng's house for witness protection. Sister Zheng, who has a good impression of Wu Weiguo, also secretly fell in love with Ah Xiong, but was unable to date him normally due to face.Soon, Ah Xiong returned to Hong Kong. Sister Zheng followed the instructions of her superiors and brought her assistants Ah Sheng, Ah Hu and Ah Xiong to Hong Kong to investigate the case, causing a lot of trouble, and stumbled towards the target of arresting the criminal...