Yi Shi-Woon, known as Shioon, endures a harsh reality at Nine Dragons High School, facing bullies like Ho Chang. When a stranger, Han Chun Woo, criticizes Shioon's passivity during a beating, Shioon discovers Chun Woo is his new English teacher. Seeking self-defense skills, Shioon records Chun Woo's impressive martial arts display and blackmails him into teaching. As Shioon delves into the martial arts world of Murim, he remains unaware of his mentor's dark past and the dangers lurking in the shadows. How will Shioon navigate this treacherous path under Chun Woo's tutelage?