The Breaker follows Shiwoon Yi, a timid high school student who endures constant bullying. His life changes when he witnesses a strange fight and meets his new teacher, Chunwoo Han, who is secretly a powerful martial artist known as the "Breaker" from the Murim world. After Shiwoon gets entangled in Chunwoo’s past and a conflict with a secret society, he begins training in martial arts to protect himself and those he cares about. Readers enjoy the series for its intense action, underdog growth story, and the mentor-student bond between the weak but determined Shiwoon and the incredible but burdened Chunwoo.