Final answer:
The walled city featured in the story and drama is A. Kowloon Walled City
Step-by-step explanation:
The walled city that is featured in the actions of this story and drama is A. Kowloon Walled City. Although there are other walled cities mentioned in the provided information, like the Great Wall of China, Berlin Wall, and Jerusalem Old City, they are not directly associated with the story and drama.