"Xihe 7" arrived at the mirror Earth on the other side of the solar system. Its landscape, architecture and even "human beings" are exactly the same as the Earth, but there is no sign of life. The astronauts explored deeply and found that time seemed to be frozen. They tracked the abnormal energy and found the underground secret laboratory, revealing the truth that it was a projection experiment targeting the earth. The device mutated during the evacuation, leaving many mysteries to be solved.
