I Build Infrastructure in Ancient Times!

My name is Su He, and I'm an utterly ordinary top student in civil engineering. If there's anything unusual about me, it's that I went to sleep in a spotless university dorm and woke up in an ancient place of exile cold enough to freeze a person into a statue. The thin prisoner's robe I was wearing was the only "starter gear" I had after transmigrating. When the old man they called Village Chief dug me out of a snowdrift, I had only one thought: survive, then repay his kindness. That kindness was greater than the heavens. The half of a black, tooth-breaking coarse-grain cake he'd stuffed into my mouth was his only food for the day.