Professor Se Jeong attends a biotech conference, only to witness it spiral into catastrophe when a rapidly mutating virus is unleashed. As the outbreak spreads and the infected begin to transform, authorities seal off the entire facility.
Jong-su bumps into a girl who used to live in the same neighborhood, who asks him to look after her cat while she's on a trip to Africa. When back, she introduces Ben, a mysterious guy she met there, who confesses his secret hobby.
