Because of rampant bullying at Eunjang High School, vulnerable students live in perpetual dread of becoming the next victim. However, their fortunes are set to shift when Gray Yeon—a lanky freshman standing no taller than 157 cm—stuns the entire class by confronting a bully twice his size and effortlessly overpowering him. Gray's brave deed, ingenuity, and distinct perspective earn him the moniker Eunjang's White Mamba. Despite his stature, Gray keeps exchanging blows with larger, stronger bullies from other local high schools, all in an effort to stop history from repeating itself.