Payload specialist, Tang Yue, who is the mechanical and electrical engineer simply by training, is left stranded upon Mars when he receives information from his AI robot associate, Old Cat, that Earth provides exploded. He believes himself as the last human in the Universe. Ends up, he is only the last man within the Universe. Botanist, Mai Dong, have been left on the United Space Train station (USS) orbiting Mars, to wait for Tang Yue’s ascent to the USS before they make their journey to Earth. But now, it’s impossible. Sign up for the trio’s quest for survival because they attempt to unravel the mystery associated with Earth’s disappearance.