In the near future, South Korea's first crewed mission to the moon ends in a tragic disaster when an explosion occurs on board. Five years later, a second human spaceflight is launched successfully but a strong solar wind causes it to malfunction. One astronaut, Sun-woo (Doh Kyung-soo) is left stranded in space. Facing another fatal catastrophe, the Naro Space Center turns to its former managing director Kim Jae-guk (Sol Kyung-gu) to help bring Sun-woo back home safely.