Forty-year-old vegetable vendor Zhou Lei is plunged into utter despair when his vegetable stall is demolished, his wife runs away with their savings, and his seven-year-old son is diagnosed with leukemia, urgently needing 800,000 in medical expenses. On a snowy night car accident, his three-thousand-yuan broken three-wheeler unexpectedly travels back to Qingzhou in the thirteenth year of Chongzhen, activating the two-realm shuttle system. The more the common people trust him, the higher the grade of the three-wheeler and the larger its cargo capacity. He travels back and forth between the two realms, transporting grain, medicine, and fine seeds in exchange for gold to save his son, while also saving villages from famine, holding his ground for warmth and sustenance in troubled times. He has no desire to vie for hegemony, seeking only to save his son and protect the villagers, but a similar mysterious iron vehicle appears in a neighboring prefecture, and the traces of another time-traveler begin to surface.