I Transmigrated to Great Qin, and Simply Staying Alive Makes Me Stronger

Zhao Yuanlang comes from an apocalyptic world in the winter of 2025. Betrayed by his teammates, he was shoved into a horde of zombies... but woke up in the Qin dynasty's Xianyang Palace, in a eunuch's “silkworm chamber,” already castrated.

Fortunately, the supernatural ability he awakened in the apocalypse is still with him, and before long, he gets a simple System...

Any one of his attributes, including physique, strength, or speed...