Yeon Sang-ho addresses how his upcoming movie Gunche will be different from Train to Busan. 2016's Train to Busan helped put Yeon on the map, introducing international audiences to his story of a zombie virus that takes over South Korea, threatening passengers who are on a train from Seoul to Busan. The film inspired a spiritual sequel, Peninsula, four years later. Though the two movies are based in the same universe, their plots are independent, making Peninsula a standalone sequel. Now, Yeon is in production on a new zombie film, Gunche.