Lin Zhao, a high school senior studying science, opens her eyes and finds herself the child bride of a family in a year of great famine.
She was bought for three dou of rice. A hemp rope is tied around her wrist, and her husband's family is already planning to sell her for another two dou of millet.
No System, no pocket dimension, no spiritual spring.
She has only an old pencil case that came with her: a magnifying glass, a steel ruler, a compass, a craft knife, and a thermometer.
And a mind that can calculate.
Someone was buried upstream, she says the water in that well isn't safe to drink.
Three days later, everyone who drank it has diarrhea.
The acorns scattered across the ground are poisonous, she says they can be eaten after being soaked in water seven times.
Seven days later, for the first time, the whole village has enough to eat.
A child's toes have turned black from the cold. She sits up all night with a knife in her hand, but in the end, she doesn't cut them off.
She knows that without disinfection or stitches, cutting would cost the child their life.
She has no magic. She has only four steps: observe, guess, test, and record.
These four steps save thirty people, then later save a city, and eventually save a nation.
[She doesn't become a god. She builds schools.]
