The Devil’s Classroom

Driven by a cold, calculating nature, Kim Sang-an spent his life as a ruthless loan shark, mastering the art of extraction. However, his world shatters when his sister, a dedicated teacher, is driven to suicide by the sadistic torment of her own students. Now, Sang-an doesn’t seek justice through the law—he seeks a debt that can only be paid in suffering. Infiltrating the school as their new homeroom teacher, he transforms the classroom into his own personal collection agency. These students may act like demons, but they have never encountered a predator more dangerous than him. As he dismantles their lives with surgical precision, he ensures every single tormentor pays their blood-debt in full. Experience this brutal tale of vengeance and psychological warfare as you keep reading on Manhuaus.