Modern youth Lin Yuan crosses over into the Great Dayu dynasty intertwined with famine and warfare. Relying on a daily 19.8-yuan set meal system, he rises step by step from a refugee outside the city. He uses cheap takeout to exchange for identity and accumulate original capital, then takes advantage of the chaos to befriend the military man Lin Meng, captures Qingfeng Stronghold, and opens up Baishi Valley as a base to cultivate high-yielding crops such as potatoes. In the process of dealing with official extortion and elite annihilation, he fights to support the war and trains elite troops. As the Xiongnu's massive southward invasion triggers a wave of refugees, he settles the refugees and expands his power, ultimately relying on the merits of suppressing bandits and pacifying the people to obtain an imperial court official post and officially start his path of hegemony to split and rule a region.