Kim Kyang-Soo (Jang Hyuk) was sleeping in his physics lesson, when teacher write X on blackboard. Teacher saw Kyang-Soo sleeping and threw his chalk towards Kyang-Soo. Kyang-Soo paused it and push it back, injured teacher. Kyang-Soo got expelled from his 8th Korean high school, and found his 9th School - WaSanGo. WaSanGo is celebrating its 108th anniversary, and the students there are excellent martial experts. They train everyday because there was a secret manuscript in WSG, with principal. The first one is the head of gang, title Dark Oxen, name Jang Rhang. He always bully classmates. The second one is the prettiest girl in WSG, Icy Jade (Shin Min-ah). She is sword expert. The third one is the Tea Expert, the best martial master in WSG, name Hak-Rim Song(SangWoo Kwone). HakRim had finished tea leaves bottle, and bring the bottle to principal, but met Kyang-Soo and both fight. Finally both got hurt and make HakRim to enter Medical Inspection Room, which HakRim had never attended, that makes some weaker WSG students to shock to see HakRim. HakRim cured himself and bring the tea bottle to principal room, but only met vice. HakRim request Vice to hand bottle to principal. Lunch time, Jang Rhang bully a classmate because the classmate was eating Fu-Yu (Fujian Red Sour ToFu) that makes JangRhang to memorize his hideous mother. HakRim stopped JangRhang by telling JangRhang that fighting is prohibited in lunch time. JangRhang order his gangster to change HakRim's tea bottle into poison leaves and principal was killed. Vice got paper that HakRim is the suspect. HakRim was jailed. Icy Jade knew HakRim isn't the one who killed principal, visited him with her best female friend. HakRim saw Icy Jade, order her to bring Kyang-Soo to HakRim. HakRim trained Kyang-Soo with all his(HakRim) known martial skills. JangRhang challenge all classmates with his Ŗ-day Ultimatum" without any WSG-schoolmates to challenge, Icy Jade trained her sword skills so that she can prepare herself and fight against JangRhang. But JangRhang reveal that the 2-day ultimatum was just "Chasing his own Love - Icy Jade", Icy Jade refused JangRhang's love. Icy Jade violated school rules and was going to expelled from WSG but Kyang-Soo made her to stay in WSG. Icy Jade finally love Kyang-Soo and Kyang-Soo finally succeeded to graduate without being expelled from WSG anymore.