2050, the era of unified Korea.
The global economy collapses, the number of poor people in downtown Seoul explodes, and policies to restrict residential areas are implemented starting from the center of Teheran-ro. A society divided into slums and commercial areas. The government will send 11 astronauts to the space station's Meteo as a secret project to overcome the energy crisis by securing a map of the Earth's resources. Ji-hoon, the astronaut's doctor, joins his terminally ill daughter to develop a new stem cell drug.
Two days are left before returning to Earth, and there is one more person in addition to the 11 designated passengers. We're trying to figure out who the intruder is, but the astronauts... one, two.. be dying in succession. Astronauts begin to doubt each other at the constant killings, and the peaceful space station is becoming a backroom of fear. Ji-hoon, who promised his daughter to return home safely, has to find the intruder and survive and return to Earth...