In 2029, South Korea's lunar exploration spacecraft Woori-ho embarks on a journey towards the Moon. The whole world pays attention to this great challenge, but a solar flare erupts, causing a solar wind to engulf the spacecraft, leaving only the crew member Hwang Sun-woo (DOH Kyung Soo) stranded alone. This is not the first time that South Korea's spacecraft has headed to the Moon. Five years ago, the Narae-ho soared into the sky with grand dreams, only to blow up into pieces upon launch. Now, in the face of another tragedy, the only survivor, Sun-woo, becomes the focus of the efforts of the Korea Aerospace Research Institute and the government. The entire nation hopes for his safe return. To ensure Sun-woo's rescue, the former flight director, Kim Jae-gook (SUL Kyung Gu), who had been researching deep in the mountains, takes responsibility for the Narae-ho accident five years ago and rejoins the mission. However, his efforts alone are not enough. In search of another hope to rescue Sun-woo, Kim seeks the assistance of NASA's lunar orbit director, Yoon Moon-young (KIM Hee Ae), but even that is not easy. Determined not to lose anyone again under his watch, Kim risks everything in a final attempt to save Sun-woo. Thus, the struggle to survive and bring back Sun-woo unfolds, with a man who sacrifices everything for the sake of survival.
