After Yi "Shioon" Shi-Woon's master, Goomoonryong, breaks his ki-center, rendering him unable to use martial arts, he decides to leave the Murim world and resume a normal life: attending school and returning home to his mother daily. However, Murim has other plans. Identified as Goomoonryong's only true disciple and entrusted with the Sunwoo Clan's Phoenix Medallion by Lady Sosul—thereby making him the interim leader of the Sunwoo Clan—the Murim world is reluctant to let Shioon go. With his new status, enemies Shioon has never encountered before keep appearing, such as the organization known as Soldiers Under Command. They are intent on eliminating him for their own prosperity, but how will Shioon defend himself without an intact ki-center?