Jiwon, a motivated new police officer, is strangely bothered after meeting Osun, a social worker. On a hot summer day, a kidnapper sends a message saying, ‘If you want to save the kidnapped child, donate money to the welfare center.’ The incident becomes a national concern as the media report it. Somehow, Jiwon doubts the link between the case and Osun.

Jung-hwan is a gruff but loving zookeeper who specializes in training wild beasts. His teenage daughter, Soo-ah, is going through puberty and a full-blown dance obsession. Their days are full of bickering and bonding... until one day, Soo-ah becomes infected by a zombie virus that has swept across the globe. Refusing to give up on his daughter, Jung-hwan takes her to a quiet seaside village called Eunbong-ri, where his mother Bam-soon lives. In a world obsessed with rooting out the infected, Soo-ah shows strange signs of awareness - responding to music, her grandmother's sharp taps with a back scratcher, and even faint traces of human language. Determined to protect her at all costs, Jung-hwan draws on his years of experience training tigers and begins a secret mission to tame and retrain... his zombie daughter.