In the novel Wandering Earth, the protagonist Liu Peiqiang was an astronomer who participated in the plan to leave the solar system and served as the pilot of the Earth's propeller. During the process of the Earth leaving the solar system, some accidents occurred, resulting in problems with the Earth's thrusters, which eventually led to the Earth leaving the solar system and entering another galaxy. When the Earth entered another galaxy, Liu Peiqiang and his colleagues began to look for a new home. In the process, they discovered a planet outside the solar system that was very suitable for human habitation, so they decided to go to this planet to find a new home. During the journey to the planet, Liu Peiqiang and his colleagues experienced a series of difficulties, including the pressure of interstellar space and the influence of flight speed. In the end, they successfully reached the planet outside the solar system and established a new home. In this process, Liu Peiqiang did not betray the coalition government. Instead, he worked hard with the other crew members to protect the survival of mankind. Finally, he successfully completed the mission of Earth's propeller and led mankind to their new home.