Three Kingdoms: Liu He, the Hostage, Farms His Way to Supremacy

An engineering student becomes Liu He of the late Han dynasty and is trapped in Yuan Shu's residence as a hostage. Armed with potatoes and a fountain pen, he struggles to survive in dire circumstances, then escapes with the help of the Xianyu clan's merchant caravan. Refusing to share his father's doomed fate, he heads north to Youzhou to build a power base, waiting for a chance to seize Bingzhou and fight for a sliver of hope for the Han dynasty amid the chaos of the Little Ice Age.