The film is based on a short story ("The Wandering Earth") by Liu Cixin.
Liu Cixin, the Chinese science fiction writer who wrote the eponymous, responded to the CCTV (China Central Television) interview and answered some questions, many of whom wanted to know the answers.
Many people cried when they saw this movie. Has this been your case?
CL: No. I watched this film from the perspective of the creator, not as an ordinary spectator. In some passages, I was thinking about
how to further improve the effects. In general, the goal is to make
the plot moving for others. It is hard to be moved by the things we
have seen many times before.
Interview with Liu Cixin about The Wandering Earth (in translation)
He receives a writing credit as Cixin Liu.