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

"Guess how many kilograms I've lost."

"Unfortunately, you're wrong." Tang Yue looked down at the number on the weighing scale. "I've only lost 14.5 kilograms."

Tomcat rolled its eyes. "What's the difference? Won't you have lost fifteen kilograms if you shat out half a kilogram of shit?"

"Do you believe that I can still raise something as heavy as fifty kilograms?" Tang Yue rolled up his robe and flexed his arm, trying hard to squeeze out his biceps.

With the warm breeze from the OGS to bathe in, Tang Yue had returned to the days of wearing ancient Roman attire. He wore pants with a thin robe draped over him.

The period back when the temperature control malfunctioned felt like a nightmare. Tang Yue didn't even know how he had survived.

Sol Two Hundred and Seventy, Evolutionary History of Life on Earth