The film is based on an original story created by Park Joo-suk. The team tried to reference the movements of the zombies in the game 7 Days to Die and the movements of the dolls from Ghost in the Shell 2: Innocence, and also reviewed the movements of the nurses in Silent Hill.[12] The film was filmed in various stations from Daejeon, Cheonan and East Daegu.[12] The water deer in the movie was created using real videos of water deer and 3D modelling.[12] The scenery that is seen outside the train in the film was shot with an LED plate rear screen technique behind the set piece that was based on the interior of the KTX-I, facilitating the increased focus on the characters.[12] The blood vessels of the zombies were drawn with an airbrush. The zombies were styled differently depending on the progress of the infection
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