Zoe had invited Lu Zhiyu to an upper-class party in London. The party was held in a mansion just on the outskirts of the city. Lu Zhiyu had accepted her invitation because he had spent a few years in Maria's World, doing nothing but experimenting with different creatures. When he first came back to the real world, he couldn't quite remember how to interact with others and even his facial expressions were unnatural.
He felt that if he kept doing this to himself, he would forget how to act like a proper human being, so he wanted to take this opportunity to get away from his experiments a little and relax. He was also very curious about the British upper-class. He had only seen such parties in movies, and he wanted to see what a real one was like.