Deng Xiaolong (played by Xu Guanying) has been upright and helpful since he was a child. His wish is to be a good policeman who fights violence and protects the people when he grows up. Unfortunately, God makes people play tricks on him. Because of his short stature and natural color blindness, he was rejected by the police station. He had to go to the security company as a guard. Security supervisor Zhou Shichang (played by Xu Guanwen) is an old oil stick, who is sarcastic and cowardly. His subordinate Sam (played by Xu Guanjie) has always disliked him, but he has no place to complain. This time, the company's prince Wang Pingfan returned from studying abroad and pretended to be a security guard to sneak into the company to investigate the situation. Soon, Sam and Xiaolong were promoted for their outstanding work, but Zhou Shichang was deprived of his supervisor position and demoted. He will be able to retire and enjoy his retirement in a few months. Will he endure this bad breath for his pension or will he have other plans?