Shotgun Boy follows Kim Gyu-nam, a bullied teenager who gains superhuman strength and resilience after surviving a violent encounter with a mysterious monster on a school rooftop. The story is a prequel to the webtoon Sweet Home and blends action, horror, and psychological drama. Readers enjoy it for its intense monster battles, the protagonist’s struggle to overcome victimization, and the darker, grittier exploration of trauma and survival within a crumbling school setting.