Tian Rui Shuo Fu

Payload specialist, Tang Yue, who is a mechanical and electrical engineer by training, is left stranded on Mars when he receives news from his AI robot assistant, Tomcat, that Earth has exploded. He believes himself to be the last human in the Universe.
Turns out, he is only the last man in the Universe. Botanist, Mai Dong, had been left on the United Space Station (USS) orbiting Mars, to await Tang Yue's ascent to the USS before they make their journey back to Earth. But now, it's impossible.
Join the trio's quest for survival as they attempt to unravel the mystery of Earth's disappearance.

Dead on Mars

CKtalon

Orion II's landing project came to a halt.

Mai Dong listened to Tang Yue's advice and gave up on descending. However, she didn't leave Mars's near-orbit. A spacecraft's orbital maneuver didn't need much time and there were still more than thirty days left until the comet arrived. Mai Dong wished to stay until the final moment.

Tomcat had the same excuse as well. It said that it was a robot with steel for bones. It didn't need oxygen or supplies and was insensitive to the changes in the environment. Therefore, it too could push back its departure and spend more time with Tang Yue.

Tang Yue frowned. "Don't tell me you guys are staying behind to have an internecine outcome with me… Ah no, live and die together?"

Sol Two Hundred and Eighty-Four, What's There to Be Afraid of Infinite Truth