Recently there has been a frightened murderer, he makes the number of murders in Hong Kong has been on the rise. Therefore, everyone dares not go out at night apart from main character Dog. Dog was not afraid, and even took the opportunity to burglary at other people's homes. He accidentally broke into the murderer's home and encountered Gary and Chiu who accidentally broke into the murderer's home at the same time, causing a situation of trapped beasts.