"Crucially, [director] Yeon has come up with a take on zombies that is rooted deep in the genre but still feels innovative. Like Romero's undead, these are an inescapable evil spreading across the world to offer a sly commentary on our modern society... Yeon establishes himself as a gifted action director: one mid-journey stop at an apparently deserted station turns into a terrifying set-piece that's among the year's best. But it's a slow struggle through carriages full of infected people to reach a stranded loved one that really stands out... In the end, Yeon goes back to the human story and delivers a surprisingly emotional climax. It may seem like a shift of tone, but maybe family ties were the point all along." - Helen O'Hara, Empire Magazine