The chief liu of Old City Police Station meets the cleaning robot. He tells her that the crime scene is a royal armor scene and that he is the new chief of the police station. He says that the people from New City are treating Old City like their backyard and that from now on he will be the chief. The cleaning robot says that it is impossible for a robot to see what is on the surface. The chief says that if they don't clean up the place on time, the bacteria in the air will grow.