Truck driver Zhang Jianjun, carrying a huge debt of 420,000, is determined to rely on charcoal transportation to pay off his debts and let his family live a stable life. Yaya, feeling sorry for her father's hard work in delivering goods, secretly climbs into the charcoal truck compartment to help watch the goods, but an unextinguished cigarette butt ignites the charcoal. The compartment quickly fills with thick smoke, and the airtight iron partition cuts off the girl's cries for help. A life-and-death crisis. As the thrilling rescue ends, a routine inspection unexpectedly uncovers a secret sealed for eight years.