A fighting genius. In grade 6, Choi Hyuk killed someone. He then promised his mother that he would never fight again. He spent his school days being bullied and blankly staring out the window. One day, a ring appeared in the middle of his classroom. Choi Hyuk, now a high schooler who had spent his whole life atoning for his sins, was faced with a decision, to kill or be killed.
A martial art expert from the Song dynasty lives like a Phoenix that can live again in another body after death. This time, he happened to take over the body of a Japanese high schooler who is also a victim of bullying and has a bit complicated family circumstances.