Who's that with Luo Ji in the three-body room?

Is cheng heart and Luo Ji live in the three-body room together. A long time ago, when I was chatting with my friends about the series of Three-body, my friends commented that when I read Three-body, I realized the unique beauty of classical literature and poetry. At that time, I was surprised by this comment from my friend. Later, I learned that many characters in the three-body are covered with the skin of science fiction, but they are all saturated with the spirit of scholar-officials in China's classical philosophy. No wonder every time I read the stories of these characters, there is always a feeling and emotion that transcends time and space.