Director Lin Pilcheng praised Liu Chengfan as a natural creator, and said that Liu Chengfan was very interested in expressing zombies. The sound of breathing and the way of walking in the state all put forward their own suggestions, and the crew also adopted them. He also joked that it would be very difficult to find a zombie that surpassed Ryu Seung-bum in South Korea.
·The powerful actor Park Hae-il dubs the robot RU-4 in the film.
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