A former arm-wrestling champion raised in the U.S. returns to South Korea for a tournament that could return him to glory, but he finds his life complicated by the appearance of the biological family he never knew.

After Seon-yoo's father committed suicide leaving behind a large sum of debt for them, Mother and 12-year-old Seon-yoo move to a new place to have new start.

When two men find their lives derailed, they meet challenges that force them to face a fierce battle to protect their loved ones.

Ji-soo, a literature enthusiast who believes a mysterious being once visited him as a child and gifted him with talent in writing, finds school life boring. But everything changes when Hyeon-joo, a bold, soccer-loving girl, transfers to his school. Her boyish charm and passion to soccer instantly captivates him. From that day on, Ji-soo is plagued by unsettling, yet vivid dreams that blur the line between reality and something far more mysterious.

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.