Train to Busan 3 begins several years after the outbreak that devastated South Korea. The virus that turned humans into fast, violent zombies has nearly disappeared, but its scars remain deep. The cities are in ruins, and survivors live under strict quarantine zones controlled by a new military government. Among them is Soo-min, a young woman who was born after the outbreak and has never seen a train move. When she hears rumors that a high-speed train has been restored to carry survivors to a safe zone in Busan, she decides to take the journey that once symbolized both horror and hope.
The film introduces a new group of characters, but the spirit of the original story remains. Soo-min is joined by a former soldier named Jae-hyuk, who lost his family during the early days of the infection, and Min-jun, a clever teenager skilled at hacking and survival. Together, they board the newly rebuilt KTX train, believing it will lead them to freedom. However, soon after departure, they realize that something is terribly wrong. One of the passengers is secretly carrying an infected child, and the nightmare begins again.
As chaos erupts inside the train, the passengers are forced to fight for their lives while the government, desperate to hide the truth, refuses to let the train stop. The infection spreads from car to car, and the survivors must make impossible choices—who to save, who to leave behind, and how to reach Busan before it’s too late. The tension builds with every screech of the rails and every flicker of the train’s lights.
In the midst of the horror, the film explores the humanity that remains in desperate times. Soo-min becomes the emotional center of the story, reminding others of compassion and unity even when surrounded by death. Her bond with the infected child adds emotional depth, forcing the audience to question whether the infected are truly monsters—or victims of a cruel world.
The climax takes place as the train approaches a destroyed bridge outside Busan. Jae-hyuk sacrifices himself to stop the infected from reaching the front car, allowing Soo-min and a few others to escape. Flames engulf the train as it derails, symbolizing the end of one journey and the uncertain beginning of another.
In the final scene, Soo-min emerges from the wreckage and sees survivors waving from the mountains of Busan. As the sun rises, she walks toward them, carrying both sorrow and hope. Train to Busan 3 ends not with fear, but with resilience—showing that even after the darkest ride, humanity still finds the strength to move forward.
