Little dog Chuichui drives his beloved little tractor to help Mom buy groceries. On the way, he accidentally runs over a stone and flips over, but fortunately, a kind passerby sees him and helps Chuichui right the little tractor. After Chuichui thanks the passerby and prepares to leave, unexpectedly, a thief appears in the park and snatches the kind person's bag. Disregarding danger, Chuichui jumps out of the car, rushes up to tackle the bad guy, and helps the kind person snatch back the bag, but because of this, he forms a grudge with the villain, who is determined to take revenge on little dog Chuichui's family.