A sudden gas-related emergency erupts at a mountain wedding banquet. Lu Cheng, a temporary wedding car driver, is the first to recognize the danger thanks to his previous experience in emergency chemical transport. Although he faces misunderstanding and exclusion because his warning threatens various people's interests, he remains steadfast in his sense of responsibility. When the danger breaks out, he puts past grievances aside, steps forward, opens an evacuation route through the back mountain, and organizes the elderly, children, and other vulnerable guests to evacuate first. Working with the rescue team, he ultimately ensures everyone's safety. Those responsible for negligence face the consequences, while Lu Cheng's ordinary yet extraordinary sense of duty demonstrates the precious principle that human life comes first, earning him the respect and recognition he deserves.