The Last Variable

"He didn't learn the rules. He derived them." He woke up in a body that wasn’t his, in a world where people cultivate spiritual energy to chase immortality. They’ve been doing it for millennia. Their best techniques retain about 3% of the energy they process. Three percent. Chen Xi can do 67%. Dr. Chen Xi was a decent physicist, a terrible husband, and the kind of man who calibrated coffee machines on Saturdays because precision was the only language he’d ever been fluent in. Then a particle accelerator exploded, he glimpsed the equation underlying reality for 0.003 seconds, and he died. On a Tuesday. The coffee went cold. His dantian is shattered — he can’t cultivate the traditional way. So he doesn’t. He builds a method that treats Qi like the fluid dynamics problem it actually is.  Rational cultivation. Real physics. An MC who counts prime numbers when he’s scared, fights by calculating resonance frequencies, and accidentally befriended a seventy-three-year-old graveyard hermit who talks to corpses and cooks the best noodles in any plane of existence.