In a mountain village in the 1980s, a broken iron bull that couldn't be shaken awake, a debt to the King of Hell of thirty-two yuan, and a father who went into the mountains for three months and didn't return. Retired farm machinery mechanic Chen Qingshan single-handedly takes over the Su family's mess, fixes the car, ventures across the mountains, turning up elm mushrooms, red pine cones, cliff rock honey, foreign trade matsutake mushrooms, and century-old ginseng step by step. He keeps the rules, cuts seven and leaves three, carries back dozens of lives in a flash flood; what he guards is the peace of the whole village. During a chance car repair, he discovers a clue to his missing father-in-law hidden under the car! A deerskin mountain map and three mysterious knife marks—do they point to treasure, or a dangerous situation? Can the broken iron bull lift poor days to richness, and can it pull back the missing father?