Seoul Station is the official animated prequel to Train to Busan. Same director, same outbreak, same city, same railway hub—just hours earlier, and told from the streets instead of a high-speed train.
Yeon Sang-ho wrote and directed both. Train to Busan (2016) follows passengers on KTX 101 as a sudden nationwide outbreak turns the journey from Seoul to Busan into a slaughter. Seoul Station, released in South Korea about a month later, is an adult animated film that shows how that outbreak first detonates in and around Seoul Station itself. Wikipedia and the rest of the franchise listings treat it as the second installment in the Train to Busan series and a prequel to the live-action hit.
Yeon has said the live-action film grew out of the animated one: he described Train to Busan as a psychological thriller about what happens the day after Seoul Station. The distributor pushed him toward live action and a bigger canvas; the result was two movies that share a world without sharing a cast.
The outbreak starts at the station
Seoul Station opens with a wounded homeless man collapsing near the station. People look away. Social workers and police treat him as a nuisance. He dies, reanimates, and bites. The infection races through the squatters living in the corridors, then into the terminal and the surrounding streets. By dawn, soldiers are firing on the horde outside. The city is already lost.
Train to Busan picks up the next morning at the same station. Seok-woo and his daughter Su-an board the KTX. News reports of riots and a mysterious outbreak are already on the air. A scraped-up young woman slips onto the train at the last second and turns. That woman is the visible link: the infection that started among people the city had already written off now rides south with the paying passengers.
The films do not recycle characters. Seoul Station follows Hye-sun, a runaway former sex worker; Ki-woong, her boyfriend who wants to pimp her again; and Suk-gyu, the man hunting her who is not the father he claims to be. Their story is smaller, meaner, and more hopeless. Train to Busan uses a different ensemble—a workaholic dad, a pregnant couple, a baseball team, a CEO—to ask who deserves to live once the train doors close. The connective tissue is place, timing, and the same fast, ferocious zombies.
Same world, different tone
Both movies use zombies as a pressure test for Korean society. Train to Busan is a blockbuster about class, selfishness, and whether a selfish man can become a father. Seoul Station is bleaker. It lingers on people already treated as disposable—the homeless, sex workers, anyone the authorities would rather lock down than save. Police and military treat the outbreak like an uprising. Quarantine lines do not distinguish the living from the infected. The animation’s muted, grey look matches that despair.
Peninsula (2020) later confirmed the shared universe: four years after the outbreak, the peninsula is a wasteland. Yeon has been clear it is not a direct sequel to Train to Busan’s characters, only the same catastrophe. Seoul Station is the piece that shows how the catastrophe began.
Why the prequel is easy to miss
Train to Busan was a Cannes midnight screening and a huge theatrical hit. Seoul Station is a low-budget adult animation that played festivals and then a quieter theatrical window. Many viewers never realized they were meant to be watched as a pair. Watch Seoul Station first and the opening of Train to Busan—the news crawl, the last-minute passenger, the speed with which Seoul is already gone—lands as aftermath, not coincidence.
They are not a single story split in two. They are two angles on the same night and morning: the people the city ignored, and the people who thought they could still catch a train out.