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For story progression. 1. A sports car driver, just before entering the tunnel entrance, sees a ghost hallucination and stops abruptly, causing a chain reaction collision with other cars. (The sports car driver is not in the accident.) 2. The sports car driver drives through the tunnel at maximum speed to escape the situation. 3. A bus driver crashes into the side of the tunnel entrance due to drowsy driving, causing a major accident. 4. Fortunately, the bus passengers are not injured. (Passengers break the windows and escape outside.) 5. 20 minutes later, Kay enters the tunnel with Geo, Pipi, and Ghost Harvey in his car. 6. The sports car driver continues to drive fast inside the tunnel, causing trouble for other cars. 7. Meanwhile, the sports car driver and a truck driver get into a dispute and race each other inside the tunnel. 8. The sports car driver throws a cigarette butt outside. (However, that cigarette butt lands in the truck's cargo bed, causing a fire to break out on top of the truck.) 9. Kay notices this, follows behind the truck, and alerts them with high beams. 10. They pull over to the shoulder and try to extinguish the fire with an emergency fire extinguisher, but fail due to its small capacity. 11. The truck driver says there are flammable and explosive drums in his vehicle and runs away. 12. Kay and Geo try to extinguish it using the fire hose inside the tunnel, but it doesn't work. 13. The tunnel fills with smoke. 14. Geo and Kay get out of the car and try to leave the tunnel, but the tunnel collapses, leaving them trapped. 15. Geo and Kay split up to look for survivors. 16. Geo and Pipi meet Chief Seo. 17. Chief Seo tries to find a way out of the tunnel using his drone skills, but it gets stuck on a panel and won't move. 18. Pipi wanders around the tunnel looking for the drone and meets Kay. 19. Then Geo and Chief Seo follow Pipi. 20. Everyone escapes, resulting in a happy ending.