In Liu's works, too many rock singers are the same person or not.

Ding Yi, a character in Liu's science fiction. This famous physicist, nicknamed sextant, has appeared in novels such as Collapse, Microscopic Ends, Wen Chaodao, Three-body, Time Migration and Ball Lightning. A sloppy, a little sloppy, but talented, almost omnipotent character. He holds two doctorates in philosophy and quantum physics, and a master's degree in mathematics. He is a first-class professor and an academician of the Chinese Academy of Sciences (and the youngest academician). He is the chief scientist of the national neutron decay research project and was nominated for the Nobel Prize in Physics last year. Although he is never the protagonist in the novel, he is an indispensable part of the main line of the novel. It can even be said that it is because of his existence that we can vaguely relate Liu to his writing world.

Generally speaking, in Liu's stories, Ding Yi always plays the role of a narrator or narrator. Many times, he always uses rational means to magically connect many seemingly chaotic, irrelevant and bizarre plots, which makes people stunned! He is more like a symbol. Sometimes I think he is a symbol that Liu replaces himself in his works. He has never been the protagonist, but then again, how many of Liu's works are based on characters? In his galaxy, the position of the sun is often an event, and the people inside are just planets orbiting the sun. Of course, this is also an obvious difference between science fiction and other literary types, that is, events often precede other elements such as characters. But Rockett is the heaviest of these planets.