Shotgun Boy is a relentless psychological horror action webtoon that serves as a dark prequel to Sweet Home, following Gyu-hwan, a deeply unstable high school student whose sadistic tendencies and obsession with violence erupt into chaos as a mysterious outbreak turns people into monsters, pushing the story into a brutal spiral of survival, manipulation, and moral collapse where human cruelty often proves more terrifying than the creatures themselves, unfolding through intense chase sequences, graphic violence, and disturbing character psychology that explore bullying, abuse, control, and the thin line between predator and victim, delivering nonstop tension and a suffocating atmosphere that gradually reveals how fear and power can rot a person from the inside, making it a harrowing and uncompromising read for fans of dark horror narratives, also known as Shotgun Boy webtoon, Shotgun Boy manhwa, Shotgun Boy Sweet Home prequel, 샷건보이, Gyu-hwan Shotgun Boy, Korean psychological horror webtoon, monster outbreak manhwa, and dark survival horror webtoon.